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A, Histogram of percentage facial ephelidae score (Y-axis) in the twin collection divided on a four-point scale (none, mild, moderate, or severe), as indicated by the color shading. The left three bars are plotted by eye color as blue (Bl), green (Gr), and brown (Br), and the right three bars are plotted by genotype at OCA2 SNP rs11855019. B, Mean total-nevus count (Y-axis), plotted against eye color in the left panel and by genotype at OCA2 SNP rs11855019 in the right panel.
