HLA-C and type 1 diabetes mellitus: Although remaining unnoticed, a preferential upregulation of HLA-B and, to a lesser degree, HLA-C was also observed in RNA-seq and proteomics studies of islets, stem cell-derived islet-like cells, and β-cell lines exposed to IFNs16,55–57, and of sorted β-cells from T1D vs. non-diabetic donors46,58,59.