Anti-CT11.9 antibodies enable researchers to detect and measure the CT11.9 antigen in biological samples. This target is a reported synonym of the SPANXN4 gene, which encodes SPANX family member N4. The human version of CT11.9 has a canonical amino acid length of 99 residues and a protein mass of 11.2 kilodaltons. CT11.9 is a member of the SPAN-X protein family.