Anti-CT1.3 antibodies are protein reagents that detect specific antigens. The CT1.3 antigen is another term for the human protein MAGE family member A3, encoded by the MAGEA3 gene. The protein is known to function in autophagy pathways and the regulation of apoptosis, among other biological roles. Canonically, it has an amino acid length of 314 residues and a mass of 34.7 kilodaltons.