Anti-CT12.2 antibodies are protein reagents that detect specific antigens. The CT12.2 antigen is another term for the human protein X antigen family member 2, encoded by the XAGE2 gene. Canonically, it has an amino acid length of 111 residues and a mass of 12.4 kilodaltons. It is expressed in the placenta. The CT12.2 protein is a member of the GAGE protein family.