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. 2009 Jul 15;9:57. doi: 10.1673/031.009.5701

Figure 2.

Figure 2.

Leucokinin 1 (LK 1) induces contractions of Rhodnius prolixus hindgut incubated in physiological saline. (A) The effects of increasing doses of LK 1 on the phasic contractions and basal tonus of R. prolixus hindgut. At 10-9 M, LK 1 increases frequency of contractions but does not affect basal tonus of the preparation. However, increasing concentrations of LK 1 induced an increase in the frequency of phasic contractions, amplitude of contractions and a change in basal tonus. (B) Even at relatively high doses, LK 1 can induce increased myoactivity with repeated doses over time for up to 90 minutes. Closed arrows indicated addition of LK 1. Open arrows indicate washing with physiological saline. The preparations were washed at 5 minute intervals for 20 minutes between applications of peptide solutions.