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We selected a grid of 3,380 markers (distributed approximately one per megabase, across the autosomes and the X chromosome) that showed strong differentiation between African- and European-ancestry samples sequenced by the 1000 Genomes Project. Markers previously genotyped on the Illumina Omni 2.5M array were favored and markers with A/T or G/C alleles were avoided.
We selected a grid of 3,380 markers (distributed approximately one per megabase, across the autosomes and the X chromosome) that showed strong differentiation between African- and European-ancestry samples sequenced by the 1000 Genomes Project. Markers previously genotyped on the Illumina Omni 2.5M array were favored and markers with A/T or G/C alleles were avoided.
=== Native American vs European Ancestry ===
=== Native American vs European Ancestry ===
