Fig. 6. Intracellular recordings from anterior esophageal constrictor (aEC) muscles reveal that early-molt larvae exhibit a sharp decline in excitatory junctional potential (EJP) amplitude compared with intermolt larvae. (A) Response of foregut muscle to endogenous frontal ganglion (FG) activity. Scale bars, 5 mV and 1 s. (B) Examples of foregut EJPs elicited by a 10 ms stimulation pulse delivered to the recurrent nerve and recorded from the aEC muscles. Scale bars, 10 ms and 5 mV for the intermolt larva and 2.5 mV for the early-molt larva. (C) The mean EJP amplitudes (± S.E.M.) recorded from intermolt larvae (open bars) and early-molt larvae (filled bars). The asterisk represents significant difference from intermolt values (P=0.05, unpaired t-test).