Abstract
Perfusion of the endogenous neuropeptide, FMRFamide, through the isolated gill of Aplysia facilitated the amplitude of the gill withdrawal reflex (GWR) evoked by tactile stimulation of the gill. The GWR was facilitated in a dose-dependent manner. The facilitation of the GWR produced by FMRFamide perfusion was reversible. In addition to facilitating GWR amplitude, FMRFamide perfusion could also prevent habituation of the reflex. It is hypothesized that FMRFamide may play a role in the peripheral nervous system (PNS) in the gill in the mediation of behavioral state and modulation of adaptive gill behaviors.
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