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Fig. 2. Effects of red pigment concentrating hormone (RPCH) on the isolated cardiac
ganglion (CG). (A) Extracellular recording from the trunk during control (top
trace) and in the presence of 10–6 mol l–1
RPCH (bottom trace). RPCH increased the burst frequency as well as the number
of motor neuron spikes (large units). (B) Pooled data bar graphs showing
significant increases in burst frequency, duty cycle, number of spikes per
bursts and spike frequency in the burst induced by RPCH over control (C)
values (Student's t-test; N=12;
*P<0.05; **P<0.01).