Fig. 5.
Proctolin application increased the amplitude of nerve-evoked contraction in muscle cells 4, 12, and 13 more than in muscle cells 6 and 7. A: representative traces from intact preparations and those preparations with muscle cells ablated, before and after 10−8 M proctolin application. B: nerve-evoked contractions from semi-intact preparations with no muscle cell ablation show that 10−8 M proctolin application induced a significant increase in contraction amplitude (P < 0.001). C: 10−8 M proctolin significantly increased the amplitude of nerve-evoked contractions in preparations with muscle cells 6 and 7 ablated (P < 0.001). D: 10−8 M proctolin significantly increased the amplitude of nerve-evoked contractions in preparations with muscle cells 12 and 13 ablated (P < 0.001). E: 10−8 M proctolin significantly increased the amplitude of nerve-evoked contractions in preparations with muscle cells 4, 12, and 13 ablated (P < 0.001). B–E: error bars, SD; N = 6–9.