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Fig. 2. Effects of 10-4 mol l-1 dibutyryl-cAMP (db-cAMP), 10-4 mol l-1 forskolin (FSK), 10-5 mol l-1 MDL-12,330A (MDL) and 10-5 mol l-1 SQ22,536 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 and 50 mmol l-1 KCl (for FSK) in normal artificial seawater. *P<0.05; {dagger}P<0.01; N, number of stimulated aliquot parts.