HLA-DRB1 and Takayasu arteritis: Takayasu arteritis was associated with alleles containing the 11-13-33 V-H-H motif (HLA-DRB1*0405) in a Turkish population but was not associated with another allele also containing V-H-H (HLA-DRB1*0401) in a European-American population; HLA-DRB1*1502, which was associated with Takayasu arteritis in both populations [35], does not contain the V-H-H motif.