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KIR Haplotype Group Nomenclature
| KIR Genotype | KIR B-Motif Content | Centromeric Haplotypes | Telomeric Haplotypes | KIR Donor Group | |
|---|---|---|---|---|---|
| A/A | 0 | A/A | A/A | “Neutral” | KIR-Neutral (0–1 B-motif) |
| B/x | 1 | A/A | A/B | ||
| A/B | A/A | ||||
| 2 | A/A | B/B | “*Better” | KIR-Better/Best (≥2 B-motifs) | |
| A/B | A/B | ||||
| B/B | A/A | *“Best” | |||
| 3 | A/B | B/B | “Better” | ||
| B/B | A/B | “Best” | |||
| 4 | B/B | B/B | |||
”Better” KIR donors have ≥2 B-motifs without Cen-B/B, and ”Best” KIR donors have ≥2 B-motifs with Cen-B/B
