Frequency distribution of HLA alleles associated with population substructure in Japanese.

<p>Each row corresponds to a cluster showing similar pattern of allele frequency distribution. Bars are color-coded depending on relative frequencies within each panel: high (red), middle (green), and low (blue). Differences in allele frequency among color-coded two or three classes were examined by means of Fisher's exact test, and the resulting <i>P</i>-values are shown.