The GeneChip Mapping 100K Set contains 116,204 variants. Since our pools contained both males and females, 2,361 X chromosomal variants could not be evaluated. No Y chromosomal variants are represented on the 100K Set. Hence, analyses were performed on autosomal variants only. In addition, the 100K Set contains 644 variants with no annotation. After exclusion due to low allele frequency (< 0.03 within a single ethnic group), 113,135 variants in the Caucasians and 113,174 variants in the African Americans were evaluated further.
