HLA-DQA1 and type 1 diabetes mellitus: Of the total 66 amino acid positions, 21 positions identified at HLA-DQα1 (11, 18, 26, 41, 45, 47, 48, 50, 52, 53, 55, 56, 61, 64, 66, 76, 80, 130, 175, 187, and 218) were associated with T1D.