KIR2DL5A (Killer Cell Immunoglobulin Like Receptor, Two Ig Domains And Long Cytoplasmic Tail 5A) is a Protein Coding gene. The encoded protein belongs to the immunoglobulin superfamily. The most recently described member of the KIR family, KIR2DL5, is represented in human populations by at least four gene variants, whose exons differ by two to eight nucleotides. KIR2DL5 (CD158f) is the most recently identified inhibitory member of human killer-cell Ig-like receptors (KIRs), which enable NK cells to sense self-HLA. KIR2DL5 is encoded by two paralogous genes displaying copy number variation and allelic polymorphism-KIR2DL5A and KIR2DL5B. Functional polymorphisms in both its promoter and its coding regions are critical for understanding the KIR2DL5 role in immunity and its importance for human health.