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Fig. 9. Synergic effects of 10–3 mol l–1 acetylcholine (ACh) with 10–9 mol l–1 octopamine (Octo), 10–5 mol l–1 tryptamine (Trypt) and with octopamine and tryptamine (Octo+Trypt) on maximal light emission (Lmax) of A. filiformis arm segments. Values (means ± S.E.M.) are expressed as a percentage of photogenesis triggered by 200 mmol l–1 KCl in normal artificial seawater. **P<0.05 in comparison to 10–3 mol l–1 acetylcholine on its own; N=8 stimulated aliquot parts per treatment.





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