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Fig. 6. Effects of L-type voltage-gated Ca2+ channel blockers on responses to proctolin and F2. (A) OOM was perfused with nifedipine (0.1 mmol l-1) saline for 30 min before 30 s pulses of PR and F2 (0.1 µmol l-1 each). (B) Verapamil (0.1 mmol l-1) was perfused for 31 min before 30 s pulses of PR and F2 (0.1 µmol l-1 each). (C) CdCl2 (1 mmol l-1) greatly attenuated tetani, but did not prevent contractures following 30 s pulses of PR (0.1 µmol l-1) or F2 (10 nmol l-1).





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