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Relationship between number of episodes of environmental asphyxia survived and the number of 5-HT neurons in the raphe magnus in wild-type animals receiving an intracerebroventricular injection of vehicle (black circles) and in Pet-1−/− animals receiving an injection of either vehicle (open circles) or 10 mg/kg caffeine (open squares). Also shown are the mean data (large symbols) ± 95% confidence intervals.
