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The external ventral protractor muscle of the VIIth abdominal segment, M234, is a skeletal muscle that possesses receptors that recognize a range of FMRFamide-related peptides and application of these peptides results in an increase in the amplitude of neurally evoked contractions with little or no effect on basal tonus. FLRFamide itself has the same biologic activity as the extended peptides, whereas...