Microsatellites analyzed and posterior probabilities assigned to each evolutionary model.

Locus categories include causative of a known trinucleotide repeat disorder (triDisorder), other trinucleotide with low variance and relatively large mean allele size (triOther), Rockman and Wray (2002) site (RW), DNase I hypersensitivity site (DNaseI), intergenic dinucleotide (InterDi), and coding dinucleotide (CodingDi). Observed variance in allele size (VAS) and mean allele size (MAS) are global–i.e., calculated using genotypes pooled from all eight populations sampled. N = neutral; ASO = additive, single-optimum; DSO = dominant, single-optimum; APO = additive, periodic-optima; DPO = dominant, periodic-optima. The evolutionary model with the greatest posterior support is bold-faced for each locus, and loci receiving greatest support from a model of selection are backshaded. Loci are ordered by motif size, then by category, and finally by VAS.