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Figure 4: The effect of bilateral administration of eticlopride, individually within the ventral tegmental area on the time spent (a) and locomotor activity parameters (b and c). Data are expressed as mean ± standard error of the mean^{++}P < 0.01 different fro m the saline control group. * P < 0.05, ** P < 0.01 different from the morphine control group (n = 7–8) 
