CD74 and psoriasis: Notably, we found that virtually all ligand receptors involved in the activity of hair follicles and other cell types could be detected in tissue sections of psoriasis patients stored for many years, such as CD74 (Psoriasis/Normal skin Ratio in CD74 protein: 1.202) and CD44 (Psoriasis/Normal skin Ratio in CD44 protein: 1.230) (Supplementary Figures 3, 4 and Supplementary Tables 5, 6).