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*a*The neutrality index (NI) was calculated from the ratio of the number of polymorphisms to the number of substitutions as follows: NI = (*Pn*/*Ps*)/(*D*n/*Ds*), where*P*is polymorphic within the population,*D*is divergence or fixed difference between populations,*n*is nonsynonymous, and*s*is synonymous. Shaded lines indicate statistically significant results that are indicative of positive selection. NA, not applicable.*b*Group 1, m1 non-Asian; group 2, ml Asian; group 3, m2.*c*The proportion of adaptive substitutions that ranges from −∞ to 1 and is estimated as 1 − NI.