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Fig. 6. Dose-dependent effect of 4-DAMP on 1 mmol l–1 ACh-induced luminescence from arm segment of A. filiformis. Bars show the average intensity of maximal light emitted after injection of 4-DAMP. Diamonds show the average intensity of light emitted induced by ACh. Maximal intensities of light emitted are expressed as a percentage of those measured in control arm segments, not treated with 4-DAMP.