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Fig. 9. Cross sections of the anterior (Ante: B,C) and posterior (Post: A,D,E) intestines from freshwater (FW: B,D)- and seawater (SW: A,C,E)-adapted eels, stained immunocytochemically with anti-eel AQP1. In seawater eel, intense immunoreaction for AQP1 was observed in the apical surface of columnar epithelial cells (arrows) in the mucosa of the posterior intestine. In addition, AQP1 immunoreaction was detected in endothelial cells of the blood vessels (arrowheads) distributed in the muscularis, submucosa and mucosa. Asterisks indicate mucous cells. Scale bars: 100 µm (A); 50 µm (B-E).