The HLA-B 3906 allele imparts a high risk of diabetes only on specific HLA-DR/DQ haplotypes.
Baschal EE, Baker PR, Eyring KR, Siebert JC, Jasinski JM, Eisenbarth GS. The HLA-B 3906 allele imparts a high risk of diabetes only on specific HLA-DR/DQ haplotypes. Diabetologia. 2011 Jul; 54(7):1702-9.