borderline significantP-value<0.1
In contrast, analysis of each individual het-c allele class resulted in a significant negative D score for het-c2 and het-c3 (P-value<0.05, all P-values for Tajima's D scores calculated using assumed beta distribution [50] ) and a borderline significant (P-value<0.1) score for het-c1 , suggesting that each het-c allele class is also under directional selection.