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Fig. 1. Effects of 10-4 mol l-1 dibutyryl-cGMP (db-cGMP) and 10-3 mol l-1 sodium nitroprusside (Na nitro) 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<0.01; N, number of stimulated aliquot parts.