Figure 1.

Effects of increasing concentrations of DrmNPF on spontaneous contractions of a single isolated Rhodnius prolixus hindgut. Closed arrows indicate addition of saline (left column) or various concentrations of DrmNPF (right column). The addition of DrmNPF was preceded by recordings of spontaneous contractions alone (A–E). Open arrows indicate washing with physiological saline. The preparation was washed at 5 minute intervals for 20 minutes between applications of peptide solutions.