HLA-DRB1 and type 1 diabetes mellitus: In Japanese populations, the typical T1D susceptibility haplotypes are DRB1*0405-DQB1*0401, DRB1*0901-DQB1*0303, and DRB1*0802-DQB1*0302, while the typical resistance haplotypes are DRB1*1501-DQB1*0602 and DRB1*1502-DQB1*0601 [9].