Anti-PAGE family member 1 antibodies are used in the immunodetection of the protein encoded by the PAGE1 gene. In humans, the canonical protein has a reported length of 146 amino acid residues and a mass of 16.2 kDa. The PAGE family member 1 protein is a member of the GAGE protein family. Other names for this target antigen include CT16.3, GAGE-9, GAGEB1, P antigen family member 1, G antigen 9, and AL5.