Anti-P antigen family, member 5 (prostate associated) antibodies enable researchers to detect and measure the P antigen family, member 5 (prostate associated) antigen in biological samples. This target is a reported synonym of the PAGE5 gene, which encodes PAGE family member 5. The human version of P antigen family, member 5 (prostate associated) has a canonical amino acid length of 130 residues and a protein mass of 14 kilodaltons, although 2 isoforms have been identified. It is reported to be notably expressed in the testis. Other names for this target antigen include P antigen family member 5 and P antigen family, member 5 (prostate associated).