Individuals with the most frequent genotype, which comprised 27% of the individuals studied, are homozygous for the group A haplotype. The remaining 110 KIR genotypes found in this study are either group A and group B heterozygotes or group B homozygotes (who are indistinguishable from heterozygotes by genotype alone).
In this study, individuals with the most common genotype, accounting for 27% of the participants, have two copies of the group A haplotype. The remaining 110 KIR genotypes are either a combination of group A and group B or consist of only one copy of the group B haplotype.