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Fig. 5. Effect of dopamine D1 or D2 receptor agonist (0.1, 1.0, 10 µmol l-1) on LC opsin mRNA expression determined in the early morning. Administration of dopamine D1 receptor agonist (A) increased LC opsin mRNA expression at all tested concentrations. Administration of D2 receptor agonist (B) produced little effect. Data represent the mean ± S.E.M. (N=16). *P<0.01; NS, not significant.