A region of chromosome 6 from position 161122860–161124861 showing the comparison of the Perlegen whole-genome data set with the SeattleSNPs data set in build 123 of dbSNP containing SNPs rs783145, rs4252128, rs4252129, rs4252130, rs4252131, rs4252132, rs4252133, rs4252134, rs4252135, rs4252136, and rs4252137. The first, second and eleventh SNPs are contained in the Perlegen data and are in bold. The Perlegen haplotypes over these SNPs that occur in the population are ACG, GCG, ACA, and GTG. When SNPs contained in the SeattleSNPs data set are added to the Perlegen SNPs, many more haplotypes emerge. For example, the first Perlegen haplotype gets split into two common haplotypes and three rare haplotypes in the SeattleSNPs data set. “I” and “D” represent insertion and deletion polymorphisms in the SeattleSNPs data set.