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Association of MAOA uVNTR genotypes and MAOA mRNA level/enzyme activity. ■, Relative MAOA mRNA level/enzyme activity in placentas with only the 3-repeat allele (n = 17). ▲, Relative MAOA mRNA level/enzyme activity in placentas with only with the 4-repeat allele (n = 33). Horizontal lines represent mean values.
