HLA-DRB1 and pemphigus foliaceus: Differential expression analysis also revealed downregulation of MHC class II molecules, such as HLA-DPA1, HLA-DPB1, HLA-DRB1, and HLA-DRA, in circulating CD14+ and intermediate monocytes from LR COVID-PF in comparison to ER COVID-PF and controls (Figures 3C, D; Supplementary Tables E5, 6).