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; P<0.01; N, number of stimulated aliquot parts.

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