Anti-CT3.5 antibodies enable researchers to detect and measure the CT3.5 antigen in biological samples. This target is a reported synonym of the MAGEB3 gene, which encodes MAGE family member B3. This protein is known to function in the regulation of transcription, among other biological roles. The human version of CT3.5 has a canonical amino acid length of 346 residues and a protein mass of 39.2 kilodaltons. It is reported to be notably expressed in the testis. Other names for this target antigen include melanoma-associated antigen B3 and MAGE-B3 antigen.