Anti-SSX family member 5 antibodies are used in the immunodetection of the protein encoded by the SSX5 gene. In humans, the canonical protein has a reported length of 188 amino acid residues and a mass of 21.7 kDa. Alternative splicing is reported to yield 2 different isoforms for this protein. A member of the SSX protein family, it is suspected to act as a modulator of transcription. Other names for this target antigen include protein SSX5 and synovial sarcoma, X breakpoint 5.