Figure 11. Potassium ion flux of a single isolated Rhodnius prolixus hindgut in vitro challenged with DrmNPF, AngNPF, and ouabain. The NPFs tested did not influence potassium ion transport across the ampulla of the hindgut. At 10⁻⁴M ouabain significantly decreased potassium ion flux over the ampulla of the hindgut. Each bar represents the mean ± SEM (N = 3). Statistics were performed on arcsine transformations. * p < 0.05, one-way ANOVA Newman-Keuls post-test.