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Figure 7


Fig. 7. Excitatory junctional potentials (EJPs) elicited in the presence of 10–8 mol l–1 crustacean cardioactive peptide (CCAP) produced significantly greater responses than those in saline. EJP responses recorded intracellularly from the anterior foregut muscles of early-molt larvae (A), and intermolt larvae (B), in control saline and after a 10 min exposure to saline plus 10–8 mol l–1 CCAP. The early-molt larvae produced significantly greater EJP responses after incubation in CCAP (paired t-test, P<0.0001), reaching values that were similar to those of the intermolt larvae in saline (unpaired t-test, P>0.5). After treatment with 10–8 mol l–1 CCAP, the average EJP amplitude recorded from the intermolt larvae increased, but was not significantly different from the saline values (paired t-test, P>0.05). *Significant increase over initial saline levels (paired t-test, P<0.0001) but is not significantly different from the intermolt saline values (unpaired t-test, P>0.05).





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