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Fig. 3. Effects of (A) serotonin (5-HT), (B) octopamine (OA), (C) norepinephrine (NE), (D) glutamate (Glu) and (E) proctolin (Proc) on arterial pressure of the anterior median artery (AMA), anterior lateral artery (ALA) and fifth lateral artery (LA5). In B, C and E, the first (top) and second traces show simultaneous recordings of pressure pulses of AMA and mechanograms of heartbeat, respectively. Other traces show arterial pressure alone recorded from preparations without heartbeat. Scale bars, 30 s.