BAGE3 is a human protein whose function is listed as unknown in UniProt. The entry describes the gene only as a candidate gene encoding tumour antigens, so no enzymatic activity, receptor interaction or signalling mechanism has been assigned to it. Researchers working with BAGE3 should therefore treat it as an under-characterised member of its family rather than a protein with a defined pathway role.

The BAGE3 protein belongs to the BAGE family, the gene group recognised by HGNC under the identifier HGNC:15728. UniProt annotates the protein as secreted, and the NCBI Gene summary, provided by the Alliance of Genome Resources, similarly states that it is predicted to be located in the extracellular region. No enzyme classification applies. The BAGE3 gene is recorded at 21p11.2, in a region that is not represented on the reference assembly, which is worth bearing in mind when designing sequence-based work. No mouse or rat ortholog is defined in the data used for this page.

The official name, BAGE family member 3, replaced the earlier designation B melanoma antigen family, member 3. UniProt uses the protein name B melanoma antigen 3, and CT2.3 is a recorded alias. These names reflect the way the family was first identified as a source of tumour antigens. Beyond this naming and the candidate tumour antigen annotation, the available sources do not describe tissue expression, disease associations or binding partners, so those details are not given here.