CD4 and type 1 diabetes mellitus: The expression of IL-21R (median) was reduced in patients with T1D both in CD3+ (27.4 x 35.0%; p=0.018) and in CD4+ T cells (10.02 x 17.0%; p=0.0028) but similar in CD8+T cells (16.5 x 15.7%; p=0.899) in comparison with controls (Supplementary Tables 6, 7).