Anti-G Antigen 6 antibodies are used in the immunodetection of the protein encoded by the GAGE6 gene. In humans, the canonical protein has a reported length of 117 amino acid residues and a mass of 12.9 kDa. It is reported to be expressed in a variety of tumor tissues but not in normal tissues, except testis. The G antigen 6 protein is a member of the GAGE protein family. Other names for this target antigen include cancer/testis antigen 4.6, cancer/testis antigen family 4, member 6, and CT4.6.