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We evaluated the effects of GR89,696 and morphine on reaching activity and cumulative rearing duration. There was a significant dose-related decrease (*P < 0.05) in the number of reaching events (A) and total time spent rearing (B) following morphine (N = 8–12, right insets) or GR89,696 (N = 6, left insets) administration, compared to baseline values.
