**p<0 01 shows difference between dose groups vs respective saline group in each class
Figure 3:Effect of L-arginine on expression of response to morphine in normal or colchicine lesioned categories using place conditioning task Animals were injected colchicine (2or8μg/rat, intra-CA1), and after recovery they were tested for place conditioning induced of morphine (2.5-7.5 mg/kg, sc) The animals then were microinjected L-arginine (0.3-3μg/rat, intra-CA1) before testing of morphine response A class legend “L-arginine alone” was simply injected saline intra-CA1 and passed the same conditioning task Control groups of all classes legend sal in Figure only received saline throughout the procedure (both intra-CA1 and peripherally).