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Dose-response curve showing the effects of DrmNPF and AngNPF on the frequency of leucokinin 1 (LK 1)-induced muscle contractions of isolated Rhodnius prolixus hindgut preparations. Results are expressed as a percentage of the frequency of muscle contractions stimulated by 10-9 M LK 1 alone. The average frequency was measured by force transducer for a 4 minute interval, 1 minute after the addition of the peptide solutions. Each point represents the mean ± SEM (N = 5).
