many different genotyping and resequencing efforts on sometimes overlapping sets of individuals. We combined genotypes for individuals of the same ethnic group. If multiple submitters genotyped the same SNP in the same person and the genotype calls are inconsistent, we assigned the person the most commonly called genotype or a missing call if they are equally split. We employed an efficient greedy algorithm that was originally implemented in TAGster (24) to select LD tag SNP for single or multiple populations.
