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Fig. 2. (A) Differences in burst frequency of the frontal ganglion (FG) rhythmic pattern in vitro and in vivo reflecting the effect of the amount of food present in the gut. Values are means ± S.D. ***P<0.001. (B) Extracellular recording from an FG nerve before (i) and after (ii) injecting petroleum jelly into the locust's previously empty crop, demonstrating the effect of the state of the gut on the rhythm.