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Fig. 3. Effects of 10-4 mol l-1 3-isobutyl-1-methyl-xanthine (IBMX) and 10-4 mol l-1 pentoxifylline (pentoxi) 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.