Two patients were tested for human leukocyte antigen (HLA) genes and were found to have the following susceptible HLA haplotype for type 1 diabetes mellitus: HLA‐A*1101:2402‐DRB1*0301:0301 and HLA-DRB1*0405;1101-HLA-DQB1*0301/27;0401 (Figure 2C). The gene discussed is HLA-A; the disease is type 1 diabetes mellitus.