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HLA class I and class II genes and number of alleles (April 2022).
| HLA locus | Number of alleles | Number of expressed proteins |
|---|---|---|
| HLA-A | 7,742 | 4,355 |
| HLA-B | 8,849 | 5,343 |
| HLA-C | 7,393 | 4,095 |
| HLA-DRA | 32 | 5 |
| HLA-DRB | 4,018 | 2,736 |
| HLA-DQA1 | 442 | 205 |
| HLA-DQA2 | 40 | 11 |
| HLA-DQB1 | 2,230 | 1,407 |
| HLA-DPA1 | 406 | 173 |
| HLA-DPA2 | 5 | 0 |
| HLA-DPB1 | 1,958 | 1,223 |
| HLA-DPB2 | 6 | 0 |
