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Regulation of DARPP-32 phosphorylation in vivo by PCA and 5-HTP. Mice were injected i.p. with saline, PCA (4 mg/kg), or 5-HTP (50 mg/kg). Fifteen minutes later mice were killed by focused microwave irradiation. Data represent means ± SE for 5–10 mice per group. *, P < 0.05; **, P < 0.01; ***, P < 0.001 compared with saline-treated mice; one-way ANOVA followed by Dunnett's test.
