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Fig. 9. The effect of the D2-selective agonists apomorphine and bromocriptine on glycoprotein secretion by the albumen gland of H. duryi. The application of apomorphine (10 µmol l-1) and bromocriptine (10 µmol l-1) had no significant effect on albumen gland protein secretion compared with control glands incubated in saline. Positive control glands incubated in 10 µmol l-1 dopamine showed a fivefold increase in protein secretion compared with saline controls. Abbreviations: CON, control; DA, dopamine; APO, apomorphine; BR, bromocriptine. Bars represent the mean ± S.E.M. of 5–8 samples (*P<0.001, Tukey test).





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