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Fig. 4. Effects of 5x10-6 mol l-1 U-73122, 5x10-7 mol l-1 U-73122, 5x10-6 mol l-1 U-73343 and 5x10-7 mol l-1 GF 109203X on KCl-induced luminescence of A. filiformis, O. aranea and O. californica dissociated photocytes. 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; {dagger}P<0.01; N, number of stimulated aliquot parts.