The frequencies of DRB1*12 alleles were determined in four US population groups by DNA sequencing. Only DRB1*120101 (or DRB1*1206 or *1210) and DRB1*120201 alleles were identified, the latter primarily in the Asian American population. Additional testing of a subset of samples to detect the presence of DRB1*1206 found all of the alleles to be DRB1*120101 (or DRB1*1210). Retesting of six samples previously typed as DRB1*1206 found only DRB1*120101 (or DRB1*1210).

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