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Timecourse of salvinorin A (0.032 mg/kg, n=4) by the intravenous or subcutaneous route, on facial relaxation (upper panel) and ptosis (lower panel). Abscissae: time from the end of injection (minutes). Ordinates: behavioral score for each behavior, within a 1-min bin (scores could therefore range from 0 to 60 s). Data are mean±SEM
