Shown is a rendering of chromosome 6 in humans, where HLA genes reside.
The relative locations of the three class II (HLA-DP, HLA-DQ, HLA-DR) and the
three class I (HLA-B, HLA-C, HLA-A) molecules are displayed. The function of the
class III molecules are not well defined, but they are not thought to be
involved in antigen processing and presentation.