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Frequency of contractions visually recorded from P5 of Drosophila Canton-S strain, determined over a 1-min interval, following replacement of hemolymph with 0.01–10 mM 5-HT and octopamine (OA) and 0.001–1 mM AKH, as compared to the activity in Drosophila saline (basal). Mean values ± SE (vertical bars) from 10 replicates for each compound.
