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Association between MC1R genotype and birth weight. Effect of the presence of V92M or R151C alleles on birth-weight standard deviation score (SDS) in (a) the congenital melanocytic nevi (CMN) cohort, and (b) control group B. SDS includes the effects of gestation and sex, and a score of +1 is equivalent to an increase in one SD from the mean of the population. Error bars are 95% confidence intervals.
