ERAP1 and psoriasis: Although originally the ERAP1 association (ERAP2 was not examined there) with psoriasis was claimed to be independent of HLA-C*06:02 (61), we recently observed different associations of ERAP1–ERAP2 haplotypes, depending on the presence versus absence of the HLA-C*06:02 gene: namely, low activity ERAP1 together with ERAP2 was protective in HLA-C*06:02-positive individuals but associated with disease risk in HLA-C*06:02-negatives.