
Population-scale analyses of STR variation. (A) Distribution of base-pair differences between each locus’ most common allele and the hg19 reference allele. (B) Patterns of linkage disequilibrium for SNPs and STRs on the X chromosome. SNP-SNP LD (dashed lines) generally exceeds SNP-STR LD (solid lines) across a range of distances for Africans (red), Admixed Americans (green), Europeans (yellow), and East Asians (blue).











