Anti-CT4.1 antibodies enable researchers to detect and measure the CT4.1 antigen in biological samples. This target is a reported synonym of the GAGE1 gene, which encodes G antigen 1. The human version of CT4.1 has a canonical amino acid length of 117 residues and a protein mass of 12.9 kilodaltons. It is reported to be notably expressed in the testis. This target antigen may also be known as CT4.1.