| CTAG1B | 
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| | Available structures | 
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 | PDB | Human UniProt search: PDBe RCSB | 
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 | | List of PDB id codes | 
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 | 1S9W, 2BNQ, 2BNR, 2F53, 2F54, 2P5E, 2P5W, 2PYE, 3GJF, 3HAE, 3KLA | 
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| Identifiers | 
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| Aliases | CTAG1B, CT6.1, CTAG, CTAG1, ESO1, LAGE-2, LAGE2B, NY-ESO-1, cancer/testis antigen 1B | 
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| External IDs | OMIM: 300156; HomoloGene: 133254; GeneCards: CTAG1B; OMA:CTAG1B - orthologs | 
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| Wikidata | 
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Cancer/testis antigen 1 also known as LAGE2 or LAGE2B is a protein that in humans is encoded by the CTAG1B gene. It is most often referenced by its alias NY-ESO-1.
Cancer/Testis Antigen 1B is a protein belonging to the family of Cancer Testis Antigens (CTA) that are expressed in a variety of malignant tumours at the mRNA and protein levels, but also restricted to testicular germ cells in normal adult tissues. A clone of CTAG gene was originally identified by immunological methods in oesophageal carcinoma using patient serum. The aberrant re-expression of CTAs is induced by molecular mechanisms including DNA demethylation, histone post-translational modification, and microRNA-mediated regulation. The effect of DNA demethylation is evident by the capability of demethylating agents, such as 5-aza-2-deoxycytidine, to induce CTAs re-expression in tumour cells but not in normal epithelial cells.