Broads and Splits

Broad, Splits and Associated Antigens

The following is a list of those specificities which arose as clear-cut splits of other specificities. Broad specificities that have Splits or associated antigens are shown. For a complete list of broad specificities please see the Antigens Table and for a complete list of associated antigens, including the new designations, please go to the Associated Antigens Table.


The previous version of this page has been updated to reflect the new four digit format for associated antigens as described in the 2026 Nomenclature Report, and we are currently reviewing the new associated antigens designations and how to incorporate into the following table.

Original Broad Specificities Splits Associated Antigens
A2 A0203, A0210
A9 A23, A24 A2403
A10 A25, A26, A34, A66
A19 A29, A30, A31, A32, A33, A74
A24 A2403
A28 A68, A69
B5 B51, B52 B5102, B5103
B7 B0703
B12 B44, B45
B14 B64, B65
B15 B62, B63, B75, B76, B77
B16 B38, B39 B3901, B3902
B17 B57, B58
B21 B49, B50 B4005
B22 B54, B55, B56
B27 B2708
B39 B3901, B3902
B40 B60, B61
B51 B5102, B5103
B70 B71, B72
Cw3 Cw9, Cw10
DR1 DR103
DR2 DR15, DR16
DR3 DR17, DR18
DR5 DR11, DR12
DR6 DR13, DR14 DR1403, DR1404
DR14 DR1403, DR1404
DQ1 DQ5, DQ6
DQ3 DQ7, DQ8, DQ9
Dw6 Dw18, Dw19
Dw7 Dw11, Dw17

Last updated: 03-Mar-2026