Distribution of relatively common HLA-A, -B, -C, and -DRB1 variants in similar case-control populations studied here (this study, N = 298) and elsewhere (N = 312).

Previously studied population consists of European Americans from the San Francisco Bay area [16]. Rare alleles at each locus are grouped together (others), with number of chromosomes (2N) used as the denominator in all tabulations. Between study populations, statistically significant differences (p��0.025) are seen with A*32, B*14, B*55, and Cw*08.