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Fig. 5. Differences of maximal light emissions (Lmax) of O. californica arm segments after stimulation by tryptamine (10–7 mol l–1 and 10–8 mol l–1) in normal ASW and in Ca2+-free ASW. Values (means ± S.E.M.) are expressed as a percentage of photogenesis triggered by 10–7 mol l–1 and 10–8 mol l–1 tryptamine, respectively, in normal artificial seawater. **P<0.01; N=8 stimulated aliquot parts for each concentration.





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