A total of 90 CpGs identified as significantly associated with schizophrenia (19% relative to 469 CpGs) overlapped with CpGs associated with RA (n = 47) and/or Height (n = 46) with an important fraction located on chromosome 6 (66%) within or nearby the extended MHC locus (Supplementary Table 7). Here, HLA-C is linked to rheumatoid arthritis.