Neurons were treated for 10 min with 10 μM and 50 μM of DA or SKF R-38393. Rap1 activation [A] and B-Raf kinase activity [B] were conducted as described in Experimental Procedures. C. Striatal neurons were pretreated for 15 min with vehicle or with the following compounds: SCH 23390 (1 μM), SMBS (20 μM), KT5720 (1 μM), then treated with 10 μM of SKF R-38393 for 10 min. B-Raf kinase activity analyses were conducted. In bar graph, blots were scanned and values expressed as the average ± S.E.M of three experiments (n=3). p<0.05 (#), represents the result of paired Student’s t test with 4 degrees of freedom for the corresponding control group.