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Figure 7


Fig. 7. Effects of D2-like dopamine (DA) antagonists, spiperone (A) (10 µmol l-1; N=6) and domperidone (B) (50 µmol l-1; N=6) on transepithelial potential differences (Vte) of posterior gills of Chasmagnathus granulatus. Mean control values (antagonist alone), were obtained 40-50 min after the beginning of the experiment. Both antagonists completely blocked the DA (10 µmol l-1) stimulating effect; means were calculated 60-80 min after the beginning of the experiment. Only when domperidone was used was the blockade reversible.





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