DRD1 and in situ carcinoma: Analysis of the change in the mRNA level of DRD1 in the NAc revealed an effect of age [F(1, 32) = 9.167, P < 0.05] and CIS exposure [F(1, 32) = 9.392, P < 0.05] but not their interaction [F(1, 32) = 0.001, P > 0.05].