<prompt> The HLA impoant in IDDM is -HLA-A3HLA-B27HLA-DR3DR4HLA-W 1  <response>: Ans. is c i.e., HLA DR3DR4 95 of IDDM Type I Diabetes Mellitus patients express either HLA DR 3or HLA DR4 or the heterozygous DR DR4 configuration. No HLA association is seen with Type II Diabetes mellitus or NIDDM. 