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Fig. 6. Differences of maximal light emissions (Lmax) of A.
filiformis arm segments after stimulation by octopamine
(109 mol l1 and 1010 mol
l1) in normal ASW and in Ca2+-free ASW. Values
(means ± S.E.M.) are expressed as a
percentage of photogenesis triggered by 109 mol
l1 and 1010 mol l1
octopamine, respectively, in normal artificial seawater. **P<0.01;
N=6 stimulated aliquot parts for each concentration.