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Fig. 7. The effect of various D2-selective antagonists on dopamine-stimulated cAMP production in isolated albumen glands of H. duryi. The D2-selective inhibitors chlorpromazine (A), eticlopride (B) and haloperidol (C) and the mixed D1/D2 antagonist butaclamol (D) affected neither basal cAMP levels nor dopamine-stimulated cAMP production in the albumen glands. Abbreviations for A: CON, control; DA, dopamine (*P<0.001, Tukey test); CLR, chlorpromazine; DA+CLR, dopamine + chlorpromazine (*P<0.001, Tukey test). Abbreviations for B: CON, control; DA, dopamine (*P<0.01, Tukey test); ETIC, eticlopride; DA+ETIC, dopamine + eticlopride (*P<0.01). Abbreviations for C: CON, control; DA, dopamine (*P<0.05, Tukey test); HAL, haloperidol; DA+HAL, dopamine + haloperidol (*P<0.05, Tukey test). Abbreviations for D: CON, control; DA, dopamine (*P<0.001, Tukey test); BUT, butaclamol; DA+BUT, dopamine + butaclamol (*P<0.001, Tukey test). All agents were used at a concentration of 10 µmol l-1. Bars represent the mean ± S.E.M. of 5–6 samples.





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