HLA-C and psoriasis: The markedly stronger reduction in HLA-C compared to the overall HLA-class I expression by UVB is relevant not least because, in addition to HLA-C*06:02, other HLA-C alleles, namely, HLA-C*07:01, HLA-C*07:02, and HLA-C*07:04, may also confer a risk for psoriasis, possibly because they belong to the same HLA supertype presenting overlapping peptide repertoires [70,71].