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Fig. 2. (A) Simultaneous extracellular recordings from two of the frontal ganglion
(FG) efferent nerves: the frontal connective (FC) and medial pharyngeal nerve
(MPN), in an isolated FG preparation. Addition of crustacean cardioactive
peptide (CCAP; 10-5 mol l-1) reversibly increased the
burst frequency. The left-hand traces show records played at a higher sweep
speed to reveal phase relations between different components of the FG central
pattern generator. (B) Application of 10-5 mol l-1 CCAP
on an in situ FG resulted in appearance of air bubbles in the crop
(broken outline).