Fig. 1. The effect of placebo (A ), 200 μg naloxone (B ), and 400 μg naloxone (C ), all given at t = 30 min on morphine-induced respiratory depression. The data are mean ± SEM. Ventilation is relative to baseline values. The arrows  represent the infusion of morphine (M), placebo (P), or naloxone (N).

Fig. 1. The effect of placebo (A ), 200 μg naloxone (B ), and 400 μg naloxone (C ), all given at t = 30 min on morphine-induced respiratory depression. The data are mean ± SEM. Ventilation is relative to baseline values. The arrows  represent the infusion of morphine (M), placebo (P), or naloxone (N).

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