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| Species | # D genes (allelic variations) |
# distinct sequences | range of lengths of D genes |
|---|---|---|---|
| Human | 27 (7) | 32 | 11–37 |
| Mouse | 31 (8) | 28 | 10–29 |
| Rat | 35 (2) | 35 | 10–29 |
| Rabbit | 14 (0) | 10 | 24–42 |
| Crab-eating macaque | 40 (0) | 35 | 11–42 |
| Alpaca | 8 (0) | 8 | 11–34 |
