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Fig. 4. Simultaneously recorded mechanograms showing effects of (A) acetylcholine (ACh), (B) serotonin (5-HT), (C) octopamine (OA), (D) glutamate (Glu) and (E) proctolin (Proc) on pressure pulses of the fifth lateral artery (LA5) and heartbeat. Bars on each trace indicate the period of agent application.