HLA-C and type 1 diabetes mellitus: Several lines of evidence including enhanced T1D incidence among Caucasians living in Europe, discordant rate of T1D among monozygotic twin pairs, and lower incidence of T1D in some individuals harboring the ‘risk genes’ indicate that although the MHC genes may impart T1D susceptibility, they are not sufficient to cause the disease [5]–[6].