Anti-KIR3DL1/S1 antibodies enable researchers to detect and measure the KIR3DL1/S1 antigen in biological samples. This target is a reported synonym of the KIR3DL1 gene, which encodes killer cell immunoglobulin like receptor, three Ig domains and long cytoplasmic tail 1. This protein is known to function in immune response pathways, among other biological roles. The human version of KIR3DL1/S1 has a canonical amino acid length of 444 residues and a protein mass of 49.1 kilodaltons, although 2 isoforms have been identified. It is reported to be localized in the cell membrane of cells. Other names for this target antigen include CD158E1, KIR, and KIR2DL5B.