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Effect of the Val/Met genotype on COMT activity in human postmortem DLPFC tissue from two different populations (African Americans and whites). The effects of the Val/Met genotype in African Americans (A) and whites (B) were similar. N = sample size. One asterisk (*) indicates difference from Val/Val at a significance level of P<.05; two asterisks (**) indicate difference from Val/Val at a significance level of P<.001.
