Killer cell immunoglobulin-like receptors (KIRs), expressed on Natural Killer (NK) cells, activate/inhibit NK cell function through interactions with their HLA-A, B and C ligands. KIR3DL1 is one of the most polymorphic genes and its effect varies depending on the interaction of the specific allotype with its Bw4 ligand. We investigated the allelic diversity of KIR3DL1/S1 using sequence based typing and we typed as well, their Bw4 ligands in Mexican Mestizos of Mexico City.
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