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KIR genes are located on chromosome 19, in the leukocyte receptor complex (LRC). The KIR gene family consists of 15 gene loci (KIR2DL1, KIR2DL2/L3, KIR2DL4, KIR2DL5A, KIR2DL5B, KIR2DS1, KIR2DS2, KIR2DS3, KIR2DS4, KIR2DS5, KIR3DL1/S1, KIR3DL2, KIR3DL3) and two pseudogenes (KIR2DP1 and KIR3DP1.) KIR genotypes can be divided into two haplotypes: A and B depending on the composition of their genes.
