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Fig. 7. Effects of the interaction between osmotic variations and theophylline on the transepithelial potential difference (Vte) in isolated posterior gills. Mean ± S.E.M. of five values are given in each column. The different letters indicate statistical differences among treatments (P<0.05). Iso + Theo: Isosmotic saline plus theophylline (2.5 mmoll-1). Hypo + Theo: Hyposmotic saline plus theophylline (2.5 mmoll-1). Iso + Theo II: after perfusing with Hyposmotic saline plus theophylline.