Human lymphocyte antigen (HLA) complex; drawing shows the long and short arms of human chromosome 6 with amplification of the HLA region, including the class I A, B, and C alleles, and the class II DP, DQ, and DR alleles.
Figure 1. HLA Complex. Human chromosome 6 with amplification of the human leukocyte antigen (HLA) region. The locations of specific HLA loci for the class I B, C, and A alleles and the class II DP, DQ, and DR alleles are shown.