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Fig. 1. Recording traces in a single unanesthetized trout, illustrating the changes
observed in ventilatory movements (ventilation), dorsal aortic blood pressure
(PDA) and electrocardiographic (ECG) signals 15 min after
intracerebroventricular (ICV) injection of (A) 0.5 µl vehicle and (B) 50
pmol NP
. Note that, compared with ICV injection of vehicle, the
injection of NP
produces an increase in ventilation rate but a potent
reduction in ventilation amplitude.