
DOI . ORG {
}
Title[redir]:
The transsulfuration pathway: a source of cysteine for glutathione in astrocytes | Amino Acids
Description:
Astrocyte cells require cysteine as a substrate for glutamate cysteine ligase (γ-glutamylcysteine synthase; EC 6.3.2.2) catalyst of the rate-limiting step of the γ-glutamylcycle leading to formation of glutathione (l-γ-glutamyl-l-cysteinyl-glycine; GSH). In both astrocytes and glioblastoma/astrocytoma cells, the majority of cysteine originates from reduction of cystine imported by the x c − cystine-glutamate exchanger. However, the transsulfuration pathway, which supplies cysteine from the indispensable amino acid, methionine, has recently been identified as a significant contributor to GSH synthesis in astrocytes. The purpose of this review is to evaluate the importance of the transsulfuration pathway in these cells, particularly in the context of a reserve pathway that channels methionine towards cysteine when the demand for glutathione is high, or under conditions in which the supply of cystine by the x c − exchanger may be compromised.
Matching Content Categories {📚}
- Education
- Science
- Health & Fitness
Content Management System {📝}
What CMS is doi.org built with?
Custom-built
No common CMS systems were detected on Doi.org, and no known web development framework was identified.
Traffic Estimate {📈}
What is the average monthly size of doi.org audience?
🏙️ Massive Traffic: 50M - 100M visitors per month
Based on our best estimate, this website will receive around 80,486,609 visitors per month in the current month.
check SE Ranking
check Ahrefs
check Similarweb
check Ubersuggest
check Semrush
How Does Doi.org Make Money? {💸}
We can't see how the site brings in money.
Earning money isn't the goal of every website; some are designed to offer support or promote social causes. People have different reasons for creating websites. This might be one such reason. Doi.org might be earning cash quietly, but we haven't detected the monetization method.
Keywords {🔍}
article, google, scholar, pubmed, cas, glutathione, cysteine, amino, pathway, cells, transsulfuration, acids, biol, cystineglutamate, human, cystathionine, neurochem, astrocytes, mcbean, glutamate, cystine, synthesis, access, redox, system, hydrogen, protein, cell, chem, brain, expression, privacy, cookies, content, acid, methionine, sulfide, kinase, banerjee, regulation, oxidative, stress, publish, research, search, exchanger, antiporter, metabolism, xct, biochem,
Topics {✒️}
l-γ-glutamyl-l-cysteinyl-glycine month download article/chapter cystathionine-γ-lyase leads human cystathionine-beta-synthase cystine/glutamate antiporter expression methionine metabolic pathways cystathionine-γ-lyase �� cystine/glutamate antiporter plp-dependent hemesensor protein dl-alpha-aminoadipate toxicity alternative trans-sulfuration reactions cystathionine gamma-lyase [3h]d-aspartate release cystathionine beta-synthase γ-glutamylcysteine synthase cystine/cysteine cycle full article pdf system xc− function brain protein synthesis glutamate transport activity primary brain tumors cystine-glutamate exchanger glutamate cysteine ligase γ-glutamylcycle leading potential target privacy choices/manage cookies retinal ganglion cells tnf-induced apoptosis l-[35s]methionine alleviates brain edema nuclear factor-κb alpha lipoic acid glioblastoma/astrocytoma cells c6 glioma cells system xc− glutamate induces release regulating enzyme activity indispensable amino acid excitatory amino acid cerebral cystine uptake check access mitochondrial dysfunction mediated p38mapk-mediated increase instant access gliomas inhibits neurodegeneration trans-sulfuration pathway glutamate transporters glast sulfur amino acids regulate gamma cystathionase rate-limiting step
Schema {🗺️}
WebPage:
mainEntity:
headline:The transsulfuration pathway: a source of cysteine for glutathione in astrocytes
description:Astrocyte cells require cysteine as a substrate for glutamate cysteine ligase (γ-glutamylcysteine synthase; EC 6.3.2.2) catalyst of the rate-limiting step of the γ-glutamylcycle leading to formation of glutathione (l-γ-glutamyl-l-cysteinyl-glycine; GSH). In both astrocytes and glioblastoma/astrocytoma cells, the majority of cysteine originates from reduction of cystine imported by the x
c
−
cystine-glutamate exchanger. However, the transsulfuration pathway, which supplies cysteine from the indispensable amino acid, methionine, has recently been identified as a significant contributor to GSH synthesis in astrocytes. The purpose of this review is to evaluate the importance of the transsulfuration pathway in these cells, particularly in the context of a reserve pathway that channels methionine towards cysteine when the demand for glutathione is high, or under conditions in which the supply of cystine by the x
c
−
exchanger may be compromised.
datePublished:2011-03-03T00:00:00Z
dateModified:2011-03-03T00:00:00Z
pageStart:199
pageEnd:205
sameAs:https://doi.org/10.1007/s00726-011-0864-8
keywords:
Transsulfuration
Brain
Astrocyte
Cysteine
Cystathionine-γ-lyase
Cystathionine-β-synthase
Glutathione
Biochemistry
general
Analytical Chemistry
Biochemical Engineering
Life Sciences
Proteomics
Neurobiology
image:
https://media.springernature.com/lw1200/springer-static/image/art%3A10.1007%2Fs00726-011-0864-8/MediaObjects/726_2011_864_Fig1_HTML.gif
https://media.springernature.com/lw1200/springer-static/image/art%3A10.1007%2Fs00726-011-0864-8/MediaObjects/726_2011_864_Fig2_HTML.gif
isPartOf:
name:Amino Acids
issn:
1438-2199
0939-4451
volumeNumber:42
type:
Periodical
PublicationVolume
publisher:
name:Springer Vienna
logo:
url:https://www.springernature.com/app-sn/public/images/logo-springernature.png
type:ImageObject
type:Organization
author:
name:Gethin J. McBean
affiliation:
name:UCD School of Biomolecular and Biomedical Science, Conway Institute, University College
address:
name:UCD School of Biomolecular and Biomedical Science, Conway Institute, University College, Dublin 4, Ireland
type:PostalAddress
type:Organization
email:[email protected]
type:Person
isAccessibleForFree:
hasPart:
isAccessibleForFree:
cssSelector:.main-content
type:WebPageElement
type:ScholarlyArticle
context:https://schema.org
ScholarlyArticle:
headline:The transsulfuration pathway: a source of cysteine for glutathione in astrocytes
description:Astrocyte cells require cysteine as a substrate for glutamate cysteine ligase (γ-glutamylcysteine synthase; EC 6.3.2.2) catalyst of the rate-limiting step of the γ-glutamylcycle leading to formation of glutathione (l-γ-glutamyl-l-cysteinyl-glycine; GSH). In both astrocytes and glioblastoma/astrocytoma cells, the majority of cysteine originates from reduction of cystine imported by the x
c
−
cystine-glutamate exchanger. However, the transsulfuration pathway, which supplies cysteine from the indispensable amino acid, methionine, has recently been identified as a significant contributor to GSH synthesis in astrocytes. The purpose of this review is to evaluate the importance of the transsulfuration pathway in these cells, particularly in the context of a reserve pathway that channels methionine towards cysteine when the demand for glutathione is high, or under conditions in which the supply of cystine by the x
c
−
exchanger may be compromised.
datePublished:2011-03-03T00:00:00Z
dateModified:2011-03-03T00:00:00Z
pageStart:199
pageEnd:205
sameAs:https://doi.org/10.1007/s00726-011-0864-8
keywords:
Transsulfuration
Brain
Astrocyte
Cysteine
Cystathionine-γ-lyase
Cystathionine-β-synthase
Glutathione
Biochemistry
general
Analytical Chemistry
Biochemical Engineering
Life Sciences
Proteomics
Neurobiology
image:
https://media.springernature.com/lw1200/springer-static/image/art%3A10.1007%2Fs00726-011-0864-8/MediaObjects/726_2011_864_Fig1_HTML.gif
https://media.springernature.com/lw1200/springer-static/image/art%3A10.1007%2Fs00726-011-0864-8/MediaObjects/726_2011_864_Fig2_HTML.gif
isPartOf:
name:Amino Acids
issn:
1438-2199
0939-4451
volumeNumber:42
type:
Periodical
PublicationVolume
publisher:
name:Springer Vienna
logo:
url:https://www.springernature.com/app-sn/public/images/logo-springernature.png
type:ImageObject
type:Organization
author:
name:Gethin J. McBean
affiliation:
name:UCD School of Biomolecular and Biomedical Science, Conway Institute, University College
address:
name:UCD School of Biomolecular and Biomedical Science, Conway Institute, University College, Dublin 4, Ireland
type:PostalAddress
type:Organization
email:[email protected]
type:Person
isAccessibleForFree:
hasPart:
isAccessibleForFree:
cssSelector:.main-content
type:WebPageElement
["Periodical","PublicationVolume"]:
name:Amino Acids
issn:
1438-2199
0939-4451
volumeNumber:42
Organization:
name:Springer Vienna
logo:
url:https://www.springernature.com/app-sn/public/images/logo-springernature.png
type:ImageObject
name:UCD School of Biomolecular and Biomedical Science, Conway Institute, University College
address:
name:UCD School of Biomolecular and Biomedical Science, Conway Institute, University College, Dublin 4, Ireland
type:PostalAddress
ImageObject:
url:https://www.springernature.com/app-sn/public/images/logo-springernature.png
Person:
name:Gethin J. McBean
affiliation:
name:UCD School of Biomolecular and Biomedical Science, Conway Institute, University College
address:
name:UCD School of Biomolecular and Biomedical Science, Conway Institute, University College, Dublin 4, Ireland
type:PostalAddress
type:Organization
email:[email protected]
PostalAddress:
name:UCD School of Biomolecular and Biomedical Science, Conway Institute, University College, Dublin 4, Ireland
WebPageElement:
isAccessibleForFree:
cssSelector:.main-content
External Links {🔗}(176)
- What's the financial gain of https://link.springer.com/privacystatement?
- Financial intake of https://link.springer.com/article/10.1007/s00726-011-0864-8/#main
- What's the total monthly financial gain of https://link.springer.com?
- Learn how profitable https://idp.springer.com/auth/personal/springernature?redirect_uri=https://link.springer.com/article/10.1007/s00726-011-0864-8 is on a monthly basis
- How much revenue does https://link.springer.com/article/10.1007/s00726-011-0864-8/#eds-c-header-nav generate?
- Get to know https://link.springer.com/journals/'s earnings
- Earnings of https://www.springernature.com/gp/authors
- https://link.springernature.com/home/ income
- https://link.springer.com/article/10.1007/s00726-011-0864-8/#eds-c-header-popup-search's revenue stream
- Learn how profitable https://order.springer.com/public/cart is on a monthly basis
- What's the total monthly financial gain of https://link.springer.com/article/10.1007/s00726-011-0864-8/?
- What's the income of https://link.springer.com/article/10.1007/s00726-011-0864-8/journal/726?
- What is the earnings of https://link.springer.com/article/10.1007/s00726-011-0864-8/#citeas?
- What's the revenue for https://link.springer.com/article/10.1007/s00726-011-0864-8/journal/726/aims-and-scope?
- What's the income generated by https://submission.nature.com/new-submission/726/3 each month?
- What is the earnings of https://link.springer.com/article/10.1007/s00726-011-0864-8/#auth-Gethin_J_-McBean-Aff1?
- What's the monthly income of https://link.springer.com/article/10.1007/s00726-011-0864-8/#Aff1?
- How much income does https://link.springer.com/article/10.1007/s00726-011-0864-8/article/10.1007/s00726-011-0864-8/metrics have?
- Profit of https://wayf.springernature.com?redirect_uri=https%3A%2F%2Flink.springer.com%2Farticle%2F10.1007%2Fs00726-011-0864-8
- What's https://link.springer.com/product/springer-plus's gross income?
- What's the monthly money flow for https://www.springernature.com/gp/librarians/licensing/agc/journals?
- What are the earnings of https://link.springer.com/10.1038/s41467-021-27414-1?fromPaywallRec=true?
- What's the total monthly financial gain of https://link.springer.com/10.1038/s41598-017-11004-7?fromPaywallRec=true?
- How much does https://link.springer.com/10.1007/978-3-030-67727-5_16?fromPaywallRec=true generate monthly?
- What's the financial outcome of https://link.springer.com/article/10.1007/s00726-011-0864-8/subjects/astrocyte?
- How much revenue does https://link.springer.com/article/10.1007/s00726-011-0864-8/subjects/glial-stem-cells produce monthly?
- How much does https://link.springer.com/article/10.1007/s00726-011-0864-8/subjects/gliogenesis net monthly?
- What's the monthly money flow for https://link.springer.com/article/10.1007/s00726-011-0864-8/subjects/metabolic-pathways?
- How much income does https://link.springer.com/article/10.1007/s00726-011-0864-8/subjects/nitrosylation have?
- Get to know what's the income of https://link.springer.com/article/10.1007/s00726-011-0864-8/subjects/translesion-synthesis
- What's the monthly money flow for http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=15581575?
- How much does https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD2cXhtVCgtL7M earn?
- What is the earnings of http://scholar.google.com/scholar_lookup?&title=The%20enzymology%20of%20cystathionine%20biosynthesis%3A%20strategies%20for%20the%20control%20of%20substrate%20and%20reaction%20specificity&journal=Arch%20Biochem%20Biophys&doi=10.1016%2Fj.abb.2004.08.024&volume=433&pages=166-175&publication_year=2005&author=Aitken%2CSM&author=Kirsch%2CJF?
- Financial intake of http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=15581573
- What's the financial gain of https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD2cXhtVCgt7fK?
- How much does http://scholar.google.com/scholar_lookup?&title=Redox%20regulation%20and%20reaction%20mechanism%20of%20human%20cystathionine-beta-synthase%3A%20a%20PLP-dependent%20hemesensor%20protein&journal=Arch%20Biochem%20Biophys&doi=10.1016%2Fj.abb.2004.08.037&volume=433&pages=144-156&publication_year=2005&author=Banerjee%2CR&author=Zou%2CCG pull in monthly?
- What's the profit of http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=17828297?
- What's the financial outcome of https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD1cXivFyrsLY%3D?
- How much money does http://scholar.google.com/scholar_lookup?&title=The%20cystine%2Fcysteine%20cycle%3A%20a%20redox%20cycle%20regulating%20susceptibility%20versus%20resistance%20to%20cell%20death&journal=Oncogene&doi=10.1038%2Fsj.onc.1210796&volume=27&pages=1618-1628&publication_year=2008&author=Banjac%2CA&author=Perisic%2CT&author=Sato%2CH&author=Seiler%2CA&author=Bannai%2CS&author=Weiss%2CN make?
- Learn about the earnings of http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=6142042
- What's the monthly income of https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DyaL2cXhtFylsbc%3D?
- How much does http://scholar.google.com/scholar_lookup?&title=Induction%20of%20cystine%20and%20glutamate%20transport%20activity%20in%20human%20fibroblasts%20by%20diethylmaleate%20and%20other%20electrophilic%20agents&journal=J%20Biol%20Chem&volume=259&pages=2435-2440&publication_year=1984&author=Bannai%2CS net monthly?
- http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=7425648's financial summary
- How much income does https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DyaL3cXls1Gju7c%3D have?
- How much cash flow does http://scholar.google.com/scholar_lookup?&title=Involvement%20of%20the%20cystathionine%20pathway%20in%20the%20biosynthesis%20of%20glutathione%20by%20isolated%20rat%20hepatocytes&journal=Arch%20Biochem%20Biophys&doi=10.1016%2F0003-9861%2880%2990009-0&volume=204&pages=80-87&publication_year=1980&author=Beatty%2CPW&author=Reed%2CDJ have monthly?
- Find out how much http://scholar.google.com/scholar_lookup?&title=Intestinal%20metabolism%20of%20sulfur%20amino%20acids&doi=10.1002%2F9780470475973.ch4&pages=47-72&publication_year=2009&author=Benight%2CN&author=Burrin%2CDG&author=Stoll%2CB earns monthly
- Get to know what's the income of http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=19261609
- What's the revenue for https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD1MXkslalt7k%3D?
- Check the income stats for http://scholar.google.com/scholar_lookup?&title=H2S%20biogenesis%20by%20human%20cystathionine%20gamma-lyase%20leads%20to%20the%20novel%20sulfur%20metabolites%20lanthionine%20and%20homolanthionine%20and%20is%20responsive%20to%20the%20grade%20of%20hyperhomocysteinemia&journal=J%20Biol%20Chem&doi=10.1074%2Fjbc.M808026200&volume=284&pages=11601-11612&publication_year=2009&author=Chiku%2CT&author=Padovani%2CD&author=Zhu%2CW&author=Singh%2CS&author=Vitvitsky%2CV&author=Banerjee%2CR
- How much does http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=19457125 pull in?
- https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD1MXosVCmtLo%3D's financial summary
- What's the income of http://scholar.google.com/scholar_lookup?&title=Sulfasalazine%20inhibits%20the%20growth%20of%20primary%20brain%20tumors%20independent%20of%20nuclear%20factor-%CE%BAB&journal=J%20Neurochem&doi=10.1111%2Fj.1471-4159.2009.06129.x&volume=110&pages=182-193&publication_year=2009&author=Chung%2CWJ&author=Sontheimer%2CH?
- Discover the revenue of http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=17095121
- How much does https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD2sXnslCrtw%3D%3D pull in monthly?
- What are the total earnings of http://scholar.google.com/scholar_lookup?&title=Inhibition%20of%20cystathionine-%CE%B3-lyase%20leads%20to%20loss%20of%20glutathione%20and%20aggravation%20of%20mitochondrial%20dysfunction%20mediated%20by%20excitatory%20amino%20acid%20in%20the%20CNS&journal=Neurochem%20Int&doi=10.1016%2Fj.neuint.2006.09.014&volume=50&pages=418-426&publication_year=2007&author=Diwakar%2CL&author=Ravindranath%2CV?
- How much does http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=9880576 pull in?
- See how much https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DyaK1MXltlagtA%3D%3D makes per month
- What's the monthly money flow for http://scholar.google.com/scholar_lookup?&title=Synthesis%20of%20the%20antioxidant%20glutathione%20in%20neurons%3A%20supply%20by%20astrocytes%20of%20CysGly%20as%20precursor%20for%20neuronal%20glutathione&journal=J%20Neurosci&volume=19&pages=562-569&publication_year=1999&author=Dringen%2CR&author=Pfeiffer%2CB&author=Hamprecht%2CB?
- https://link.springer.com/doi/10.1007/s00441-005-0116-x's revenue stream
- How much does http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=16609915 earn?
- What's the financial outcome of https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD28XjsVeksbs%3D?
- How much profit does http://scholar.google.com/scholar_lookup?&title=Expression%20of%20the%20cystine-glutamate%20exchanger%20%28xc%E2%88%92%29%20in%20retinal%20ganglion%20cells%20and%20regulation%20by%20nitric%20oxide%20and%20oxidative%20stress&journal=Cell%20Tissue%20Res&doi=10.1007%2Fs00441-005-0116-x&volume=324&pages=189-202&publication_year=2006&author=Dun%2CY&author=Mysona%2CB&author=Ells%2CT&author=Amarnath%2CL&author=Shamsul%2COM&author=Ganapathy%2CV make?
- How much does http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=18182055 generate monthly?
- How much revenue does https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD1cXmsVOls74%3D bring in?
- How much money does http://scholar.google.com/scholar_lookup?&title=Glutamate%20induces%20release%20of%20glutathione%20from%20cultured%20rat%20astrocytes%E2%80%94a%20possible%20neuroprotective%20mechanism&journal=J%20Neurochem&doi=10.1111%2Fj.1471-4159.2008.05216.x&volume=105&pages=1144-1152&publication_year=2008&author=Frade%2CJ&author=Pope%2CS&author=Schmidt%2CM&author=Dringen%2CR&author=Barbosa%2CR&author=Pocock%2CJ generate?
- Find out how much http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=1402894 earns monthly
- What are the earnings of https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DyaK38XmtV2ms7g%3D?
- What's the income generated by http://scholar.google.com/scholar_lookup?&title=Brain%20protein%20synthesis%20in%20the%20conscious%20rat%20using%20l-%5B35S%5Dmethionine%3A%20relationship%20of%20methionine%20specific%20activity%20between%20plasma%20and%20precursor%20compartment%20and%20evaluation%20of%20methionine%20metabolic%20pathways&journal=J%20Neurochem&doi=10.1111%2Fj.1471-4159.1992.tb08458.x&volume=59&pages=1437-1443&publication_year=1992&author=Grange%2CE&author=Gharib%2CA&author=Lepetit%2CP&author=Guillaud%2CJ&author=Sarda%2CN&author=Bobillier%2CP each month?
- How much does http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=19815389 rake in every month?
- What are the earnings of https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD1MXhsFGrsLrO?
- Get to know http://scholar.google.com/scholar_lookup?&title=Docosahexaenoic%20acid%20decreases%20plasma%20homocysteine%20via%20regulating%20enzyme%20activity%20and%20mRNA%20expression%20involved%20in%20methionine%20metabolism&journal=Nutrition&doi=10.1016%2Fj.nut.2009.05.015&volume=26&pages=112-119&publication_year=2010&author=Huang%2CT&author=Wahlqvist%2CML&author=Li%2CD's earnings
- How much does http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=20060865 bring in each month?
- What's the monthly money flow for https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BC3cXis1ehsrc%3D?
- How much does http://scholar.google.com/scholar_lookup?&title=Glutathione%20depletion%20causes%20a%20JNK%20and%20p38MAPK-mediated%20increase%20in%20expression%20of%20cystathionine-%CE%B3-lyase%20and%20upregulation%20of%20the%20transsulfuration%20pathway%20in%20C6%20glioma%20cells&journal=Neurochem%20Int&doi=10.1016%2Fj.neuint.2010.01.004&volume=56&pages=611-619&publication_year=2010&author=Kandil%2CS&author=Brennan%2CL&author=McBean%2CGJ generate monthly?
- http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=17369508 income
- What's the income of https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD2sXnvVagt74%3D?
- What's the financial outcome of http://scholar.google.com/scholar_lookup?&title=Activation%20of%20apoptosis%20signal%20regulating%20kinase%201%20%28ASK1%29%20and%20translocation%20of%20death-associated%20protein%2C%20Daxx%2C%20in%20substantia%20nigra%20pars%20compacta%20in%20a%20mouse%20model%20of%20Parkinson%E2%80%99s%20disease%3A%20protection%20by%20alpha%20lipoic%20acid&journal=FASEB%20J&doi=10.1096%2Ffj.06-7580com&volume=21&pages=2226-2236&publication_year=2007&author=Karunakaran%2CD&author=Diwakar%2CL&author=Saeed%2CU&author=Agarwal%2CV&author=Ramikrishnan%2CS&author=Iyengar%2CS?
- How much does http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=7906874 earn?
- What's the monthly money flow for https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DyaK2cXltFSgtw%3D%3D?
- What is the earnings of http://scholar.google.com/scholar_lookup?&title=Cystine%2Fglutamate%20antiporter%20expression%20in%20retinal%20M%C3%BCller%20glial%20cells%3A%20implications%20for%20DL-alpha-aminoadipate%20toxicity&journal=Neuroscience&doi=10.1016%2F0306-4522%2893%2990080-Y&volume=57&pages=473-482&publication_year=1993&author=Kato%2CS&author=Ishita%2CS&author=Suguwara%2CK&author=Mawatari%2CK?
- http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=18687745's financial summary
- How much money does https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:STN:280:DC%2BD1cjjs1Oquw%3D%3D generate?
- Financial intake of http://scholar.google.com/scholar_lookup?&title=Analysis%20of%2011C-methionine%20uptake%20in%20low-grade%20gliomas%20and%20correlation%20with%20proliferative%20activity&journal=Am%20J%20Neuroradiol&doi=10.3174%2Fajnr.A1242&volume=29&pages=1867-1871&publication_year=2008&author=Kato%2CT&author=Shinoda%2CJ&author=Oka%2CN&author=Miwa%2CK&author=Nakayama%2CN&author=Yano%2CH
- http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=9436784's financial summary
- Monthly income for https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:STN:280:DyaK1c%2Fpslartg%3D%3D
- What are the total earnings of http://scholar.google.com/scholar_lookup?&title=Utilization%20of%20cysteine%20and%20cysteine%20precursors%20for%20the%20synthesis%20of%20glutathione%20in%20astroglial%20cultures%3A%20preference%20for%20cystine&journal=Glia&doi=10.1002%2F%28SICI%291098-1136%28199801%2922%3A1%3C11%3A%3AAID-GLIA2%3E3.0.CO%3B2-B&volume=22&pages=11-18&publication_year=1998&author=Kranich%2CO&author=Dringen%2CR&author=Sandberg%2CM&author=Hamprecht%2CB?
- Revenue of http://scholar.google.com/scholar_lookup?&title=Rapid%20activation%20of%20glutamate%20cysteine%20ligase%20following%20oxidative%20stress&journal=J%20Biol%20Chem&volume=285&pages=16116-16124&publication_year=2010&author=Krejsa%2CCM&author=Franklin%2CCC&author=White%2CCC&author=Ledbetter%2CJA&author=Schieven%2CGL&author=Kavanagh%2CTJ
- How much does http://scholar.google.com/scholar_lookup?&title=Sounding%20the%20alarm%3A%20protein%20kinase%20cascades%20activated%20by%20stress%20and%20inflammation&journal=J%20Biol%20Chem&doi=10.1074%2Fjbc.271.40.24313&volume=271&pages=24313-24316&publication_year=1996&author=Kyriakas%2CJM&author=Avruch%2CJ earn?
- What's the profit of http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=19631409?
- Monthly income for https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD1MXhtVKgsL7L
- What's the income of http://scholar.google.com/scholar_lookup?&title=Astrocytes%20produce%20the%20antiinflammatory%20and%20neuroprotective%20agent%2C%20hydrogen%20sulfide&journal=Neurobiol%20Aging&doi=10.1016%2Fj.neurobiolaging.2009.06.001&volume=30&pages=1523-1534&publication_year=2009&author=Lee%2CM&author=Schwab%2CC&author=Yu%2CS&author=McGeer%2CE&author=McGeer%2CPL?
- What's the monthly money flow for http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=16718684?
- Monthly income for http://scholar.google.com/scholar_lookup?&title=Hydrogen%20sulphide%20regulates%20calcium%20homeostasis%20in%20microglial%20cells&journal=Glia&doi=10.1002%2Fglia.20362&volume=54&pages=116-124&publication_year=2006&author=Lee%2CSW&author=Hu%2CYS&author=Hu%2CLF&author=Lu%2CQ&author=Dawe%2CGS&author=Moore%2CPK
- What's the profit of http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=19486912?
- How much cash flow does https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD1MXpt1Oht7c%3D have monthly?
- Get to know what's the income of http://scholar.google.com/scholar_lookup?&title=Actions%20and%20interactions%20of%20nitric%20oxide%2C%20carbon%20monoxide%20and%20hydrogen%20sulfide%20in%20the%20cardiovascular%20system%20and%20in%20inflammation%E2%80%94a%20tale%20of%20three%20gases%21&journal=Pharmacol%20Ther&doi=10.1016%2Fj.pharmthera.2009.05.005&volume=123&pages=386-400&publication_year=2009&author=Li%2CL&author=Hsu%2CA&author=Moore%2CPK
- What's the profit of http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=18181196?
- What's https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD1cXlvVKgt7s%3D's gross income?
- Learn about the earnings of http://scholar.google.com/scholar_lookup?&title=The%20x%28c%29%E2%88%92%20cystine%2Fglutamate%20antiporter%3A%20a%20potential%20target%20for%20therapy%20of%20cancer%20and%20other%20diseases&journal=J%20Cell%20Physiol&doi=10.1002%2Fjcp.21366&volume=215&pages=593-602&publication_year=2008&author=Lo%2CM&author=Wang%2CYZ&author=Gout%2CPW
- How much does http://scholar.google.com/scholar_lookup?&title=Oxidative%20stress%20as%20a%20signal%20to%20up-regulate%20gamma%20cystathionase%20in%20the%20fetal-to-neonatal%20transition%20in%20rats&journal=Cell%20Mol%20Biol&volume=53&issue=Suppl&pages=OL1010-OL1014&publication_year=2007&author=Mart%C3%ADn%2CJA&author=Pereda%2CJ&author=Mart%C3%ADnez-L%C3%B3pez%2CI&author=Escrig%2CR&author=Miralles%2CV&author=Pallard%C3%B3%2CFV make?
- What's the monthly money flow for http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=12774022?
- How much revenue does https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD3sXkvFWlur8%3D bring in?
- Profit of http://scholar.google.com/scholar_lookup?&title=Mechanisms%20for%20sensitization%20to%20TNF-induced%20apoptosis%20by%20acute%20glutathione%20depletion%20in%20murine%20hepatocytes&journal=Hepatology&doi=10.1053%2Fjhep.2003.50230&volume=37&pages=1425-1434&publication_year=2003&author=Matsumaru%2CK&author=Cheng%2CJ&author=Kaplowitz%2CN
- Earnings of http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=12119142
- What's the income generated by https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD38Xlt1OgsL0%3D each month?
- Financial intake of http://scholar.google.com/scholar_lookup?&title=Cerebral%20cystine%20uptake%3A%20a%20tale%20of%20two%20transporters&journal=Trends%20Pharmacol%20Sci&doi=10.1016%2FS0165-6147%2802%2902060-6&volume=23&pages=299-302&publication_year=2002&author=McBean%2CGJ
- How much money does http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=11041866 generate?
- Revenue of https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD3cXms1OlsLw%3D
- Income figures for http://scholar.google.com/scholar_lookup?&title=The%20quantitatively%20important%20relationship%20between%20homocysteine%20metabolism%20and%20glutathione%20synthesis%20by%20the%20transsulfuration%20pathway%20and%20its%20regulation%20by%20redox%20changes&journal=Biochemistry&doi=10.1021%2Fbi001088w&volume=39&pages=13005-13011&publication_year=2000&author=Mosharov%2CE&author=Cranford%2CMR&author=Banerjee%2CR
- How much revenue does http://scholar.google.com/scholar_lookup?&title=Effects%20of%20hyperglycaemia%20and%20oxidative%20stress%20on%20the%20glutamate%20transporters%20GLAST%20and%20system%20xc%E2%88%92%20in%20mouse%20retinal%20M%C3%BCller%20glial%20cells&journal=Cell%20Tissue%20Res&volume=335&pages=477-488&publication_year=2009&author=Mysona%2CB&author=Dun%2CY&author=Duplantier%2CJ&author=Ganapathy%2CV&author=Smith%2CSB generate?
- Discover the revenue of https://link.springer.com/doi/10.1007/s11064-009-9984-x
- Learn how profitable http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=19760175 is on a monthly basis
- Monthly income for https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD1MXlsFOmsbc%3D
- What's the monthly money flow for http://scholar.google.com/scholar_lookup?&title=Regulation%20of%20%5B3H%5DD-aspartate%20release%20from%20mammalian%20isolated%20retinase%20by%20hydrogen%20sulfide&journal=Neurochem%20Res&doi=10.1007%2Fs11064-009-9984-x&volume=34&pages=1962-1968&publication_year=2009&author=Opere%2CCA&author=Monjok%2CEM&author=Kulkarni%2CKH&author=Njie%2CYF&author=Ohia%2CSE?
- http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=17853447 income
- How much cash flow does https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD2sXhtlWjs7jK have monthly?
- How much does http://scholar.google.com/scholar_lookup?&title=Comparative%20localization%20of%20cystathionine%20beta-synthase%20and%20cystathionine%20gamma-lyase%20in%20retina%3A%20differences%20between%20amphibians%20and%20mammals&journal=J%20Comp%20Neurol&doi=10.1002%2Fcne.21468&volume=505&pages=158-165&publication_year=2007&author=Pong%2CWW&author=Stouracova%2CR&author=Frank%2CN&author=Kraus%2CJP&author=Eldred%2CWD gross monthly?
- How much profit does https://link.springer.com/doi/10.1007/s11010-006-9389-y generate?
- How much does http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=17180248 pull in monthly?
- How much does https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD2sXmtFegurw%3D generate monthly?
- How much profit does http://scholar.google.com/scholar_lookup?&title=Importance%20of%20the%20trans-sulfuration%20pathway%20in%20cancer%20prevention%20and%20promotion&journal=Mol%20Cell%20Biochem&doi=10.1007%2Fs11010-006-9389-y&volume=301&pages=1-12&publication_year=2007&author=Rosado%2CJO&author=Salvador%2CM&author=Bonatto%2CD generate?
- Earnings of http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=12498985
- What's the revenue for https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD38Xpslamu7Y%3D?
- Learn about the earnings of http://scholar.google.com/scholar_lookup?&title=Vitamin%20C%20inhibits%20diethylmaleate-induced%20l-cystine%20transport%20in%20human%20vascular%20smooth%20muscle%20cells&journal=Free%20Radic%20Biol%20Med&doi=10.1016%2FS0891-5849%2802%2901192-9&volume=34&pages=103-110&publication_year=2003&author=Ruiz%2CE&author=Siow%2CRCM&author=Bartlett%2CSR&author=Jenner%2CAM&author=Sato%2CH&author=Bannai%2CS
- Check the income stats for http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=11213471
- How much income does https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD3MXlvFyhtQ%3D%3D have?
- How much profit does http://scholar.google.com/scholar_lookup?&title=Molecular%20cloning%20and%20expression%20of%20human%20xCT%2C%20the%20light%20chain%20of%20amino%20acid%20transport%20system%20xc%E2%88%92&journal=Antioxid%20Redox%20Signal&doi=10.1089%2Fars.2000.2.4-665&volume=2&pages=665-671&publication_year=2000&author=Sato%2CH&author=Tamba%2CM&author=Kuriyama-Matsumura%2CK&author=Okuno%2CS&author=Bannai%2CS generate?
- What's the income generated by http://scholar.google.com/scholar_lookup?&title=Small%20interfering%20RNA-mediated%20xCT%20silencing%20in%20gliomas%20inhibits%20neurodegeneration%20and%20alleviates%20brain%20edema&journal=Nat%20Med&doi=10.1038%2Fnm1772&volume=15&pages=629-632&publication_year=2008&author=Savaskan%2CNE&author=Heckl%2CA&author=Hahnen%2CE&author=Engelhorn%2CT&author=Doerfler%2CA&author=Gansladt%2CO each month?
- How much does http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=19531479 rake in every month?
- What's https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD1MXpsFymu7Y%3D's gross income?
- Financial intake of http://scholar.google.com/scholar_lookup?&title=Relative%20contributions%20of%20cystathionine%20beta-synthase%20and%20gamma-cystathionase%20to%20H2S%20biogenesis%20via%20alternative%20trans-sulfuration%20reactions&journal=J%20Biol%20Chem&doi=10.1074%2Fjbc.M109.010868&volume=284&pages=22457-22466&publication_year=2009&author=Singh%2CS&author=Padovani%2CD&author=Leslie%2CRA&author=Chiku%2CT&author=Banerjee%2CR
- http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=18284616's financial summary
- How much money does https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD1cXlt1Wrs7o%3D make?
- What are the total earnings of http://scholar.google.com/scholar_lookup?&title=A%20role%20for%20glutamate%20in%20growth%20and%20invasion%20of%20primary%20brain%20tumors&journal=J%20Neurochem&doi=10.1111%2Fj.1471-4159.2008.05301.x&volume=105&pages=287-295&publication_year=2008&author=Sontheimer%2CH?
- Earnings of http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=19374832
- https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD1MXivVeht70%3D's revenue stream
- Revenue of http://scholar.google.com/scholar_lookup?&title=Characterisation%20of%20cystathionine%20gamma-lyase%2Fhydrogen%20sulphide%20pathway%20in%20ischaemia%2Freperfusion%20injury%3A%20an%20in%20vivo%20study&journal=Eur%20J%20Pharmacol&doi=10.1016%2Fj.ejphar.2009.01.041&volume=606&pages=205-209&publication_year=2009&author=Tripatara%2CP&author=Patel%2CNS&author=Brancaleone%2CV&author=Renshaw%2CD&author=Rocha%2CJ&author=Sepodes%2CB
- How much does http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Abstract&list_uids=17005561 make?
- https://link.springer.com/article/10.1007/s00726-011-0864-8/articles/cas-redirect/1:CAS:528:DC%2BD28Xht1ajtrjP income
- What's the financial intake of http://scholar.google.com/scholar_lookup?&title=A%20functional%20transulfuration%20pathway%20in%20the%20brain%20links%20to%20glutathione%20homeostasis&journal=J%20Biol%20Chem&doi=10.1074%2Fjbc.M602799200&volume=281&pages=35785-35793&publication_year=2006&author=Vitvitsky%2CV&author=Thomas%2CM&author=Ghorpade%2CA&author=Gendleman%2CHE&author=Banerjee%2CR?
- Learn about the earnings of https://citation-needed.springer.com/v2/references/10.1007/s00726-011-0864-8?format=refman&flavour=references
- What's the total monthly financial gain of https://link.springer.com/article/10.1007/s00726-011-0864-8/search?sortBy=newestFirst&dc.creator=Gethin%20J.%20McBean?
- What's the monthly income of https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=search&term=Gethin%20J.%20McBean?
- What's the total monthly financial gain of https://scholar.google.co.uk/scholar?as_q=&num=10&btnG=Search+Scholar&as_epq=&as_oq=&as_eq=&as_occt=any&as_sauthors=%22Gethin%20J.%20McBean%22&as_publication=&as_ylo=&as_yhi=&as_allsubj=all&hl=en?
- What's the financial gain of https://link.springer.com/article/10.1007/s00726-011-0864-8/mailto:[email protected]?
- What's the total monthly financial gain of https://s100.copyright.com/AppDispatchServlet?title=The%20transsulfuration%20pathway%3A%20a%20source%20of%20cysteine%20for%20glutathione%20in%20astrocytes&author=Gethin%20J.%20McBean&contentID=10.1007%2Fs00726-011-0864-8©right=Springer-Verlag&publication=0939-4451&publicationDate=2011-03-03&publisherName=SpringerNature&orderBeanReset=true?
- How much income is https://citation-needed.springer.com/v2/references/10.1007/s00726-011-0864-8?format=refman&flavour=citation earning monthly?
- How much does https://link.springer.com/article/10.1007/s00726-011-0864-8/search?query=Transsulfuration&facet-discipline="Life%20Sciences" pull in?
- How much revenue does https://link.springer.com/article/10.1007/s00726-011-0864-8/search?query=Brain&facet-discipline="Life%20Sciences" bring in?
- How much does https://link.springer.com/article/10.1007/s00726-011-0864-8/search?query=Astrocyte&facet-discipline="Life%20Sciences" pull in?
- What's the monthly money flow for https://link.springer.com/article/10.1007/s00726-011-0864-8/search?query=Cysteine&facet-discipline="Life%20Sciences"?
- https://link.springer.com/article/10.1007/s00726-011-0864-8/search?query=Cystathionine-%CE%B3-lyase&facet-discipline="Life%20Sciences"'s total income per month
- How much profit does https://link.springer.com/article/10.1007/s00726-011-0864-8/search?query=Cystathionine-%CE%B2-synthase&facet-discipline="Life%20Sciences" generate?
- https://link.springer.com/article/10.1007/s00726-011-0864-8/search?query=Glutathione&facet-discipline="Life%20Sciences" income
- What are the total earnings of https://link.springer.com/journals/a/1?
- Learn about the earnings of https://link.springer.com/books/a/1
- How much profit does https://link.springer.com/journals generate?
- What is the monthly revenue of https://authorservices.springernature.com/go/sn/?utm_source=SNLinkfooter&utm_medium=Web&utm_campaign=SNReferral?
- How much does https://www.springernature.com/gp/open-research/about/the-fundamentals-of-open-access-and-open-research pull in?
- What's the financial intake of https://www.springernature.com/gp/products?
- How much revenue does https://www.springernature.com/gp/librarians generate?
- What's the monthly money flow for https://www.springernature.com/gp/societies?
- How much does https://www.springernature.com/gp/partners gross monthly?
- How much does https://www.springer.com/ gross monthly?
- How much money does https://www.nature.com/ make?
- Monthly income for https://www.biomedcentral.com/
- Get to know what's the income of https://www.palgrave.com/
- How much does https://www.apress.com/ pull in?
- How much cash flow does https://link.springer.com/brands/discover have monthly?
- What's the profit of https://www.springernature.com/gp/legal/ccpa?
- What's the profit of https://www.springernature.com/gp/info/accessibility?
- What's the revenue for https://link.springer.com/termsandconditions?
- https://support.springernature.com/en/support/home's revenue stream
- What's the income of https://link.springer.com/legal-notice?
- Learn about the earnings of https://support.springernature.com/en/support/solutions/articles/6000255911-subscription-cancellations
- What are the total earnings of https://www.springernature.com/?
Analytics and Tracking {📊}
- Google Tag Manager
Libraries {📚}
- Clipboard.js
- Prism.js
Emails and Hosting {✉️}
Mail Servers:
- mx.zoho.eu
- mx2.zoho.eu
- mx3.zoho.eu
Name Servers:
- josh.ns.cloudflare.com
- zita.ns.cloudflare.com
CDN Services {📦}
- Crossref