HLA-DRB1 and rheumatoid arthritis: In contrast to the allele at the position 9,304, the “A” allele at position 9,139 was observed in the RA-resistant alleles (DRB1*04:03:01:02, DRB1*04:06:01, and DRB1*04:07:01:02) and RA-non-association allele (DRB1*04:04:01), whereas the “G” allele was observed in the other 37 HLA-DRB1 alleles including the RA-susceptible alleles (Table 4).