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Q8N3U4 (STAG2_HUMAN) Reviewed, UniProtKB/Swiss-Prot

Last modified January 25, 2012. Version 97. Feed History...

Clusters with 100%, 90%, 50% identity | Documents (5) | Third-party data text xml rdf/xml gff fasta
to top of pageNames·Attributes·General annotation·Ontologies·Interactions·Alt products·Sequence annotation·Sequences·References·Cross-refs·Entry info·DocumentsCustomize order

Names and origin

Protein namesRecommended name:
Cohesin subunit SA-2
Alternative name(s):
SCC3 homolog 2
Stromal antigen 2
Gene names
Name:STAG2
Synonyms:SA2
OrganismHomo sapiens (Human)
Taxonomic identifier9606 [NCBI]
Taxonomic lineageEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiMammaliaEutheriaEuarchontogliresPrimatesHaplorrhiniCatarrhiniHominidaeHomo

Protein attributes

Sequence length1231 AA.
Sequence statusComplete.
Protein existenceEvidence at protein level

General annotation (Comments)

Function

Component of cohesin complex, a complex required for the cohesion of sister chromatids after DNA replication. The cohesin complex apparently forms a large proteinaceous ring within which sister chromatids can be trapped. At anaphase, the complex is cleaved and dissociates from chromatin, allowing sister chromatids to segregate. The cohesin complex may also play a role in spindle pole assembly during mitosis. Ref.8

Subunit structure

Interacts directly with RAD21 in cohesin complex. Cohesin complexes are composed of a heterodimer between a SMC1 protein (SMC1A or SMC1B) and SMC3, which are attached via their hinge domain, and RAD21 which link them at their heads, and one STAG protein (STAG1, STAG2 or STAG3). In cohesin complexes, STAG2 is mutually exclusive with STAG1 and STAG3.

Subcellular location

Nucleus. Chromosome. Chromosomecentromere. Note: Associates with chromatin. Before prophase it is scattered along chromosome arms. During prophase, most of cohesin complexes dissociate from chromatin probably because of phosphorylation by PLK1, except at centromeres, where cohesin complexes remain. At anaphase, the RAD21 subunit of cohesin is cleaved, leading to the dissociation of the complex from chromosomes, allowing chromosome separation. In germ cells, cohesin complex dissociates from chromatin at prophase I, and may be replaced by a meiosis-specific cohesin complex.

Post-translational modification

Phosphorylated by PLK1. The large dissociation of cohesin from chromosome arms during prophase is partly due to its phosphorylation By similarity. Ref.9 Ref.10 Ref.11 Ref.12

Sequence similarities

Belongs to the SCC3 family.

Contains 1 SCD (stromalin conservative) domain.

Sequence caution

The sequence CAA99732.1 differs from that shown. Reason: Erroneous initiation.

Binary interactions

Alternative products

This entry describes 2 isoforms produced by alternative splicing. [Align] [Select]
Isoform 1 (identifier: Q8N3U4-1)

This isoform has been chosen as the 'canonical' sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry.
Isoform 2 (identifier: Q8N3U4-2)

The sequence of this isoform differs from the canonical sequence as follows:
     1156-1156: N → NTQVTWMLAQRQQEEARQQQERAAMSYVKLRTNLQHAI

Sequence annotation (Features)

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifier

Molecule processing

Chain1 – 12311231Cohesin subunit SA-2
PRO_0000120185

Regions

Domain293 – 37886SCD
Compositional bias1096 – 11016Poly-Ser

Amino acid modifications

Modified residue6071N6-acetyllysine Ref.13
Modified residue10581Phosphoserine Ref.11 Ref.12
Modified residue10611Phosphoserine Ref.9 Ref.10 Ref.11 Ref.12
Modified residue10651Phosphoserine Ref.11
Modified residue11121Phosphothreonine Ref.12
Modified residue11601Phosphothreonine By similarity

Natural variations

Alternative sequence11561N → NTQVTWMLAQRQQEEARQQQ ERAAMSYVKLRTNLQHAI in isoform 2.
VSP_041119
Natural variant6991N → K.
Corresponds to variant rs6655782 [ dbSNP | Ensembl ].
VAR_060114

Experimental info

Sequence conflict461G → D in CAD38591. Ref.1
Sequence conflict3021A → R in CAA99732. Ref.5
Sequence conflict3271S → G in CAD38591. Ref.1
Sequence conflict607 – 6082KH → ND in CAA99732. Ref.5
Sequence conflict7061W → R in CAA99732. Ref.5
Sequence conflict7101A → V in CAD38591. Ref.1
Sequence conflict8351I → T in CAD38591. Ref.1
Sequence conflict9711A → T in CAH18271. Ref.1
Sequence conflict9921H → Y in CAD38591. Ref.1
Sequence conflict11051S → T in CAA99732. Ref.5
Sequence conflict11441M → K in CAA99732. Ref.5

Sequences

Sequence LengthMass (Da)Tools
Isoform 1 [UniParc].

Last modified August 16, 2005. Version 3.
Checksum: 692358EFFFF61BB9

FASTA1,231141,326
        10         20         30         40         50         60 
MIAAPEIPTD FNLLQESETH FSSDTDFEDI EGKNQKQGKG KTCKKGKKGP AEKGKGGNGG 

        70         80         90        100        110        120 
GKPPSGPNRM NGHHQQNGVE NMMLFEVVKM GKSAMQSVVD DWIESYKHDR DIALLDLINF 

       130        140        150        160        170        180 
FIQCSGCKGV VTAEMFRHMQ NSEIIRKMTE EFDEDSGDYP LTMAGPQWKK FKSSFCEFIG 

       190        200        210        220        230        240 
VLVRQCQYSI IYDEYMMDTV ISLLTGLSDS QVRAFRHTST LAAMKLMTAL VNVALNLSIN 

       250        260        270        280        290        300 
MDNTQRQYEA ERNKMIGKRA NERLELLLQK RKELQENQDE IENMMNAIFK GVFVHRYRDA 

       310        320        330        340        350        360 
IAEIRAICIE EIGIWMKMYS DAFLNDSYLK YVGWTMHDKQ GEVRLKCLTA LQGLYYNKEL 

       370        380        390        400        410        420 
NSKLELFTSR FKDRIVSMTL DKEYDVAVQA IKLLTLVLQS SEEVLTAEDC ENVYHLVYSA 

       430        440        450        460        470        480 
HRPVAVAAGE FLYKKLFSRR DPEEDGMMKR RGRQGPNANL VKTLVFFFLE SELHEHAAYL 

       490        500        510        520        530        540 
VDSMWDCATE LLKDWECMNS LLLEEPLSGE EALTDRQESA LIEIMLCTIR QAAECHPPVG 

       550        560        570        580        590        600 
RGTGKRVLTA KEKKTQLDDR TKITELFAVA LPQLLAKYSV DAEKVTNLLQ LPQYFDLEIY 

       610        620        630        640        650        660 
TTGRLEKHLD ALLRQIRNIV EKHTDTDVLE ACSKTYHALC NEEFTIFNRV DISRSQLIDE 

       670        680        690        700        710        720 
LADKFNRLLE DFLQEGEEPD EDDAYQVLST LKRITAFHNA HDLSKWDLFA CNYKLLKTGI 

       730        740        750        760        770        780 
ENGDMPEQIV IHALQCTHYV ILWQLAKITE SSSTKEDLLR LKKQMRVFCQ ICQHYLTNVN 

       790        800        810        820        830        840 
TTVKEQAFTI LCDILMIFSH QIMSGGRDML EPLVYTPDSS LQSELLSFIL DHVFIEQDDD 

       850        860        870        880        890        900 
NNSADGQQED EASKIEALHK RRNLLAAFCK LIVYTVVEMN TAADIFKQYM KYYNDYGDII 

       910        920        930        940        950        960 
KETMSKTRQI DKIQCAKTLI LSLQQLFNEM IQENGYNFDR SSSTFSGIKE LARRFALTFG 

       970        980        990       1000       1010       1020 
LDQLKTREAI AMLHKDGIEF AFKEPNPQGE SHPPLNLAFL DILSEFSSKL LRQDKRTVYV 

      1030       1040       1050       1060       1070       1080 
YLEKFMTFQM SLRREDVWLP LMSYRNSLLA GGDDDTMSVI SGISSRGSTV RSKKSKPSTG 

      1090       1100       1110       1120       1130       1140 
KRKVVEGMQL SLTEESSSSD SMWLSREQTL HTPVMMQTPQ LTSTIMREPK RLRPEDSFMS 

      1150       1160       1170       1180       1190       1200 
VYPMQTEHHQ TPLDYNRRGT SLMEDDEEPI VEDVMMSSEG RIEDLNEGMD FDTMDIDLPP 

      1210       1220       1230 
SKNRRERTEL KPDFFDPASI MDESVLGVSM F 

« Hide

Isoform 2 [UniParc].

Checksum: 38F24736F06D9054
Show »

FASTA1,268145,751

References

« Hide 'large scale' references
[1]"The full-ORF clone resource of the German cDNA consortium."
Bechtel S., Rosenfelder H., Duda A., Schmidt C.P., Ernst U., Wellenreuther R., Mehrle A., Schuster C., Bahr A., Bloecker H., Heubner D., Hoerlein A., Michel G., Wedler H., Koehrer K., Ottenwaelder B., Poustka A., Wiemann S., Schupp I.
BMC Genomics 8:399-399(2007) [PubMed: 17974005] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORMS 1 AND 2).
Tissue: Retina and Spinal cord.
[2]"The DNA sequence of the human X chromosome."
Ross M.T., Grafham D.V., Coffey A.J., Scherer S., McLay K., Muzny D., Platzer M., Howell G.R., Burrows C., Bird C.P., Frankish A., Lovell F.L., Howe K.L., Ashurst J.L., Fulton R.S., Sudbrak R., Wen G., Jones M.C. expand/collapse author list , Hurles M.E., Andrews T.D., Scott C.E., Searle S., Ramser J., Whittaker A., Deadman R., Carter N.P., Hunt S.E., Chen R., Cree A., Gunaratne P., Havlak P., Hodgson A., Metzker M.L., Richards S., Scott G., Steffen D., Sodergren E., Wheeler D.A., Worley K.C., Ainscough R., Ambrose K.D., Ansari-Lari M.A., Aradhya S., Ashwell R.I., Babbage A.K., Bagguley C.L., Ballabio A., Banerjee R., Barker G.E., Barlow K.F., Barrett I.P., Bates K.N., Beare D.M., Beasley H., Beasley O., Beck A., Bethel G., Blechschmidt K., Brady N., Bray-Allen S., Bridgeman A.M., Brown A.J., Brown M.J., Bonnin D., Bruford E.A., Buhay C., Burch P., Burford D., Burgess J., Burrill W., Burton J., Bye J.M., Carder C., Carrel L., Chako J., Chapman J.C., Chavez D., Chen E., Chen G., Chen Y., Chen Z., Chinault C., Ciccodicola A., Clark S.Y., Clarke G., Clee C.M., Clegg S., Clerc-Blankenburg K., Clifford K., Cobley V., Cole C.G., Conquer J.S., Corby N., Connor R.E., David R., Davies J., Davis C., Davis J., Delgado O., Deshazo D., Dhami P., Ding Y., Dinh H., Dodsworth S., Draper H., Dugan-Rocha S., Dunham A., Dunn M., Durbin K.J., Dutta I., Eades T., Ellwood M., Emery-Cohen A., Errington H., Evans K.L., Faulkner L., Francis F., Frankland J., Fraser A.E., Galgoczy P., Gilbert J., Gill R., Gloeckner G., Gregory S.G., Gribble S., Griffiths C., Grocock R., Gu Y., Gwilliam R., Hamilton C., Hart E.A., Hawes A., Heath P.D., Heitmann K., Hennig S., Hernandez J., Hinzmann B., Ho S., Hoffs M., Howden P.J., Huckle E.J., Hume J., Hunt P.J., Hunt A.R., Isherwood J., Jacob L., Johnson D., Jones S., de Jong P.J., Joseph S.S., Keenan S., Kelly S., Kershaw J.K., Khan Z., Kioschis P., Klages S., Knights A.J., Kosiura A., Kovar-Smith C., Laird G.K., Langford C., Lawlor S., Leversha M., Lewis L., Liu W., Lloyd C., Lloyd D.M., Loulseged H., Loveland J.E., Lovell J.D., Lozado R., Lu J., Lyne R., Ma J., Maheshwari M., Matthews L.H., McDowall J., McLaren S., McMurray A., Meidl P., Meitinger T., Milne S., Miner G., Mistry S.L., Morgan M., Morris S., Mueller I., Mullikin J.C., Nguyen N., Nordsiek G., Nyakatura G., O'dell C.N., Okwuonu G., Palmer S., Pandian R., Parker D., Parrish J., Pasternak S., Patel D., Pearce A.V., Pearson D.M., Pelan S.E., Perez L., Porter K.M., Ramsey Y., Reichwald K., Rhodes S., Ridler K.A., Schlessinger D., Schueler M.G., Sehra H.K., Shaw-Smith C., Shen H., Sheridan E.M., Shownkeen R., Skuce C.D., Smith M.L., Sotheran E.C., Steingruber H.E., Steward C.A., Storey R., Swann R.M., Swarbreck D., Tabor P.E., Taudien S., Taylor T., Teague B., Thomas K., Thorpe A., Timms K., Tracey A., Trevanion S., Tromans A.C., d'Urso M., Verduzco D., Villasana D., Waldron L., Wall M., Wang Q., Warren J., Warry G.L., Wei X., West A., Whitehead S.L., Whiteley M.N., Wilkinson J.E., Willey D.L., Williams G., Williams L., Williamson A., Williamson H., Wilming L., Woodmansey R.L., Wray P.W., Yen J., Zhang J., Zhou J., Zoghbi H., Zorilla S., Buck D., Reinhardt R., Poustka A., Rosenthal A., Lehrach H., Meindl A., Minx P.J., Hillier L.W., Willard H.F., Wilson R.K., Waterston R.H., Rice C.M., Vaudin M., Coulson A., Nelson D.L., Weinstock G., Sulston J.E., Durbin R.M., Hubbard T., Gibbs R.A., Beck S., Rogers J., Bentley D.R.
Nature 434:325-337(2005) [PubMed: 15772651] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
[3]Mural R.J., Istrail S., Sutton G.G., Florea L., Halpern A.L., Mobarry C.M., Lippert R., Walenz B., Shatkay H., Dew I., Miller J.R., Flanigan M.J., Edwards N.J., Bolanos R., Fasulo D., Halldorsson B.V., Hannenhalli S., Turner R. expand/collapse author list , Yooseph S., Lu F., Nusskern D.R., Shue B.C., Zheng X.H., Zhong F., Delcher A.L., Huson D.H., Kravitz S.A., Mouchard L., Reinert K., Remington K.A., Clark A.G., Waterman M.S., Eichler E.E., Adams M.D., Hunkapiller M.W., Myers E.W., Venter J.C.
Submitted (SEP-2005) to the EMBL/GenBank/DDBJ databases
Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
[4]"The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC)."
The MGC Project Team
Genome Res. 14:2121-2127(2004) [PubMed: 15489334] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORM 1).
Tissue: Eye.
[5]"SA-1, a nuclear protein encoded by one member of a novel gene family: molecular cloning and detection in hemopoietic organs."
Carramolino L., Lee B.C., Zaballos A., Peled A., Barthelemy I., Shav-Tal Y., Prieto I., Carmi P., Gothelf Y., Gonzalez de Buitrago G., Aracil M., Marquez G., Barbero J.L., Zipori D.
Gene 195:151-159(1997) [PubMed: 9305759] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [MRNA] OF 48-1231 (ISOFORM 1).
Tissue: Thymus.
[6]Erratum
Carramolino L., Lee B.C., Zaballos A., Peled A., Barthelemy I., Shav-Tal Y., Prieto I., Carmi P., Gothelf Y., Gonzalez de Buitrago G., Aracil M., Marquez G., Barbero J.L., Zipori D.
Gene 206:283-286(1998)
[7]"Characterization of vertebrate cohesin complexes and their regulation in prophase."
Sumara I., Vorlaufer E., Gieffers C., Peters B.H., Peters J.-M.
J. Cell Biol. 151:749-762(2000) [PubMed: 11076961] [Abstract]
Cited for: IDENTIFICATION IN A COHESIN COMPLEX WITH SMC1A AND SMC3.
[8]"STAG2 and Rad21 mammalian mitotic cohesins are implicated in meiosis."
Prieto I., Pezzi N., Buesa J.M., Kremer L., Barthelemy I., Carreiro C., Roncal F., Martinez A., Gomez L., Fernandez R., Martinez-A C., Barbero J.L.
EMBO Rep. 3:543-550(2002) [PubMed: 12034751] [Abstract]
Cited for: FUNCTION IN EARLY STEPS OF MEIOSIS.
[9]"Large-scale characterization of HeLa cell nuclear phosphoproteins."
Beausoleil S.A., Jedrychowski M., Schwartz D., Elias J.E., Villen J., Li J., Cohn M.A., Cantley L.C., Gygi S.P.
Proc. Natl. Acad. Sci. U.S.A. 101:12130-12135(2004) [PubMed: 15302935] [Abstract]
Cited for: PHOSPHORYLATION [LARGE SCALE ANALYSIS] AT SER-1061, MASS SPECTROMETRY.
Tissue: Cervix carcinoma.
[10]"Global, in vivo, and site-specific phosphorylation dynamics in signaling networks."
Olsen J.V., Blagoev B., Gnad F., Macek B., Kumar C., Mortensen P., Mann M.
Cell 127:635-648(2006) [PubMed: 17081983] [Abstract]
Cited for: PHOSPHORYLATION [LARGE SCALE ANALYSIS] AT SER-1061, MASS SPECTROMETRY.
Tissue: Cervix carcinoma.
[11]"A quantitative atlas of mitotic phosphorylation."
Dephoure N., Zhou C., Villen J., Beausoleil S.A., Bakalarski C.E., Elledge S.J., Gygi S.P.
Proc. Natl. Acad. Sci. U.S.A. 105:10762-10767(2008) [PubMed: 18669648] [Abstract]
Cited for: PHOSPHORYLATION [LARGE SCALE ANALYSIS] AT SER-1058; SER-1061 AND SER-1065, MASS SPECTROMETRY.
Tissue: Cervix carcinoma.
[12]"Quantitative phosphoproteomic analysis of T cell receptor signaling reveals system-wide modulation of protein-protein interactions."
Mayya V., Lundgren D.H., Hwang S.-I., Rezaul K., Wu L., Eng J.K., Rodionov V., Han D.K.
Sci. Signal. 2:RA46-RA46(2009) [PubMed: 19690332] [Abstract]
Cited for: PHOSPHORYLATION [LARGE SCALE ANALYSIS] AT SER-1058; SER-1061 AND THR-1112, MASS SPECTROMETRY.
Tissue: Leukemic T-cell.
[13]"Lysine acetylation targets protein complexes and co-regulates major cellular functions."
Choudhary C., Kumar C., Gnad F., Nielsen M.L., Rehman M., Walther T., Olsen J.V., Mann M.
Science 325:834-840(2009) [PubMed: 19608861] [Abstract]
Cited for: ACETYLATION [LARGE SCALE ANALYSIS] AT LYS-607, MASS SPECTROMETRY.
[14]"Initial characterization of the human central proteome."
Burkard T.R., Planyavsky M., Kaupe I., Breitwieser F.P., Buerckstuemmer T., Bennett K.L., Superti-Furga G., Colinge J.
BMC Syst. Biol. 5:17-17(2011) [PubMed: 21269460] [Abstract]
Cited for: IDENTIFICATION BY MASS SPECTROMETRY [LARGE SCALE ANALYSIS].
+Additional computationally mapped references.

Cross-references

Sequence databases

EMBL
GenBank
DDBJ
AL831939 mRNA. Translation: CAD38591.1.
CR749433 mRNA. Translation: CAH18271.1.
AL355476 Genomic DNA. Translation: CAI40990.1.
AL355476 Genomic DNA. Translation: CAI40991.1.
CH471107 Genomic DNA. Translation: EAX11853.1.
CH471107 Genomic DNA. Translation: EAX11854.1.
CH471107 Genomic DNA. Translation: EAX11855.1.
CH471107 Genomic DNA. Translation: EAX11856.1.
CH471107 Genomic DNA. Translation: EAX11857.1.
BC001765 mRNA. Translation: AAH01765.2.
Z75331 mRNA. Translation: CAA99732.1. Different initiation.
IPIIPI00470883.
IPI00552978.
RefSeqNP_001036214.1. NM_001042749.1.
NP_001036215.1. NM_001042750.1.
NP_001036216.1. NM_001042751.1.
NP_006594.3. NM_006603.4.
UniGeneHs.496710.
Hs.624663.

3D structure databases

ProteinModelPortalQ8N3U4.
ModBaseSearch...

Protein-protein interaction databases

DIPDIP-35418N.
IntActQ8N3U4. 11 interactions.
MINTMINT-6178117.
STRINGQ8N3U4.

PTM databases

PhosphoSiteQ8N3U4.

Polymorphism databases

DMDM73621291.

Proteomic databases

PRIDEQ8N3U4.

Protocols and materials databases

StructuralBiologyKnowledgebaseSearch...

Genome annotation databases

EnsemblENST00000371144; ENSP00000360186; ENSG00000101972.
ENST00000371157; ENSP00000360199; ENSG00000101972.
ENST00000371160; ENSP00000360202; ENSG00000101972.
GeneID10735.
KEGGhsa:10735.
UCSCuc004etz.2. human.

Organism-specific databases

CTD10735.
GeneCardsGC0XP123094.
H-InvDBHIX0017034.
HGNCHGNC:11355. STAG2.
HPAHPA002857.
MIM300826. gene.
neXtProtNX_Q8N3U4.
PharmGKBPA36177.
GenAtlasSearch...

Phylogenomic databases

eggNOGprNOG11650.
GeneTreeENSGT00390000014094.
HOVERGENHBG057636.
PhylomeDBQ8N3U4.

Enzyme and pathway databases

ReactomeREACT_111183. Meiosis.
REACT_152. Cell Cycle, Mitotic.
REACT_383. DNA Replication.

Gene expression databases

ArrayExpressQ8N3U4.
BgeeQ8N3U4.
CleanExHS_STAG2.
GenevestigatorQ8N3U4.
GermOnlineENSG00000101972. Homo sapiens.

Family and domain databases

InterProIPR011989. ARM-like.
IPR016024. ARM-type_fold.
IPR020839. SCD.
IPR013721. STAG.
[Graphical view]
Gene3DG3DSA:1.25.10.10. ARM-like. 5 hits.
KOK06671.
PfamPF08514. STAG. 1 hit.
[Graphical view]
SUPFAMSSF48371. ARM-type_fold. 1 hit.
PROSITEPS51425. SCD. 1 hit.
[Graphical view]
ProtoNetSearch...

Other

NextBio40752.
SOURCESearch...

Entry information

Entry nameSTAG2_HUMAN
AccessionPrimary (citable) accession number: Q8N3U4
Secondary accession number(s): B1AMT5 expand/collapse secondary AC list , D3DTF5, O00540, Q5JTI6, Q68DE9, Q9H1N8
Entry history
Integrated into UniProtKB/Swiss-Prot: March 25, 2003
Last sequence update: August 16, 2005
Last modified: January 25, 2012
This is version 97 of the entry and version 3 of the sequence. [Complete history]
Entry statusReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program
DisclaimerAny medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care.

Relevant documents

Human chromosome X

Human chromosome X: entries, gene names and cross-references to MIM

Human entries with polymorphisms or disease mutations

List of human entries with polymorphisms or disease mutations

Human polymorphisms and disease mutations

Index of human polymorphisms and disease mutations

MIM cross-references

Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot

SIMILARITY comments

Index of protein domains and families