Increase in number of informative heterozygotes and associated SNPs using two transcribed SNPs per gene.

*Multiple testing was taken into account by calculating the family wise error rate using a Bonferroni correction for the 56 SNPs tested. Associations with family wise error rate using a threshold of 0.05 (that corresponds to a nominal P value of 8.9×10−4 or −log10P of 3.05) were called significant. SNPs with less than 8 informative heterozygotes were excluded.