Susceptible DRB1 alleles for type 1 diabetes are DRB1*03:01, *04:01, *04:02, *04:04, *04:05, and *08:01 and protective alleles are DRB1*15:01, *14:01, and *07:01 in European populations [27]. Here, HLA-DRB1 is linked to type 1 diabetes mellitus.