Baseline cAMP in CHO cells. (A) When assayed simultaneously, Rhes did not affect baseline cAMP values, whereas AGS1/Dexras1 did (*p<0.05 by One-Factor ANOVA with post-hoc Bonferroni tests, n = 5). (B) The D1 receptor antagonist SCH23390 attenuated baseline cAMP accumulation in a concentration-responsive fashion. Data were analyzed by One-Factor ANOVA followed by Bonferroni post-tests. *p<0.05, **p<0.01, n = 4.