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Fig. 6. Effect of fertilization on cAMP concentration in Spisula oocytes. Oocytes (0.2% v/v) were divided in two lots, which were either inseminated at time t=0 (, Fertilized) or not ({circ}, Unfertilized). At indicated times, oocytes were sampled for determinations of cAMP concentration, as described in Materials and Methods. GVBD was less than 2% in unfertilized oocytes. Mean results (±s.e.m.) of two experiments are shown.