Anti-CT5.1 antibodies enable researchers to detect and measure the CT5.1 antigen in biological samples. This target is a reported synonym of the SSX1 gene, which encodes SSX family member 1. This protein is known to function in the regulation of transcription, among other biological roles. The human version of CT5.1 has a canonical amino acid length of 188 residues and a protein mass of 21.9 kilodaltons. It is reported to be notably expressed in the testis. CT5.1 is a member of the SSX protein family.