Anti-CT3.1 antibodies enable researchers to detect and measure the CT3.1 antigen in biological samples. This target is a reported synonym of the MAGEB1 gene, which encodes MAGE family member B1. This protein is known to function in the regulation of transcription, among other biological roles. The human version of CT3.1 has a canonical amino acid length of 347 residues and a protein mass of 39 kilodaltons. It is reported to be notably expressed in the testis.