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a) AMY2B CNV regressed by absolute latitude at breed location of origin for 252 dogs. When absolute latitude is used as a proxy for starch intake, absolute latitude does not predict AMY2B copy number. Variation increases at 40° latitude. b) Tukey boxplot of AMY2B copy number in dog breeds originating from below 40° latitude and above 40° latitude. Variation in AMY2B copy number increases at higher latitudes.
