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In (1), the placement of the symbols for the significance levels in Figure 3C is incorrect. On P. 295, Figure 3C (Carbamazepine) the symbols ‘b,c’ should appear directly above the ‘Quinpirole + forskolin’ line in the graph. We have included the corrected version of this figure and apologize for this error.

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Figure 3.  Effect of the local infusion of forskolin (100 μM) or quinpirole (100 μM) simultaneously with forskolin (100 μM) (starting at arrows and maintained for 30 min) on extracellular levels of cyclic adenosine monophosphate (cAMP) in the prefrontal cortex of (A) control rats, or rats chronically treated with (B) lithium, (C) carbamazepine, (D) vehicle or (E) valproate. The basal cAMP level was taken as the average cAMP concentration in the four consecutive samples collected from 3 h after the insertion of the probe. Thereafter, the agent of interest (100 μM forskolin or 100 μM quinpirole plus 100 μM forskolin) dissolved in Ringer solution was infused through the probe, for 60 min, and seven samples were collected. The extracellular cAMP levels in the dialysates were measured by radioimmunoassay analysis and expressed as percentages of the basal value. Results are expressed as means ± SEM, from four to six independent experiments. The rats were treated or not with therapeutic doses of lithium, carbamazepine or valproate, for 3 weeks, as indicated in Fig. 2. Data were analysed by one-way ANOVA, followed by post hoc Bonferroni's test. ap <0.001, compared with cAMP produced 60 min after the infusion of forskolin in control rats; bp <0.001, compared with cAMP produced 60 min after the infusion of quinpirole plus forskolin in control rats; cp < 0.001, compared with cAMP produced 60 min after the infusion of forskolin in carbamazepine-treated rats; dp <0.001, compared with cAMP produced 60 min after the infusion of forskolin in vehicle-treated rats.

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