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Fig. 2. The time course of cAMP production by the albumen gland of H. duryi after application of dopamine (DA) or the adenylate cyclase activator forskolin (FSK). The application of dopamine (10 µmol l-1) or forskolin (10 µmol l-1) significantly increased albumen gland cAMP production between 5 and 20 min. Note, in the presence of forskolin, dopamine-stimulated cAMP production was potentiated. Each point represents the mean ± S.E.M. of 4–6 samples. CON, control.