Anti-CD158d antibodies enable researchers to detect and measure the CD158d antigen in biological samples. This target is a reported synonym of the KIR2DL4 gene, which encodes killer cell immunoglobulin like receptor, two Ig domains and long cytoplasmic tail 4. This protein is known to function in signal transduction pathways, among other biological roles. The human version of CD158d has a canonical amino acid length of 377 residues and a protein mass of 41.5 kilodaltons, although 6 isoforms have been identified. It is reported to be localized in the cell membrane of cells. CD158d is a member of the Immunoglobulin protein superfamily.