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Effects of 18-MC (10–40 mg/kg) or vehicle on operant self-administration of sucrose and water. Baseline responses per hour for sucrose averaged (±SEM) 52.0±9.6 while baseline responses per hour for water averaged (±SEM) 792±121. Each data point represents the mean (±SEM) percent of baseline of six rats. *p<0.005, significant difference between drug vs. vehicle, Newman–Keuls test
