Anti-SR antibodies enable researchers to detect and measure the SR antigen in biological samples. This target is a reported synonym of the SCTR gene, which encodes secretin receptor. This protein is known to function in brain development and receptor-mediated signaling pathways, among other biological roles. The human version of SR has a canonical amino acid length of 440 residues and a protein mass of 50.2 kilodaltons. It is reported to be localized in the cell membrane of cells. SR is a member of the G-protein coupled receptor 2 protein family.