Anti-SPANXA2 antibodies are used in the immunodetection of the protein SPANX family member A2. It is notably expressed in the testis. Synonyms for this target antigen include Cancer/testis antigen 11.3, Cancer/testis-associated protein CTp11, Nuclear-associated protein SPAN-Xc, SPANX family member A, and sperm protein associated with the nucleus on the X chromosome A.