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Most teleost fish are ammoniotelic, and relatively few are ureotelic, in which the majority of nitrogenous waste is excreted as urea. This study aimed to determine whether the gill ultrastructure of ureotelic fish might have specific, unique characteristics compared with ammoniotelic fish. The present data suggest that the urea-transporter protein, recently found in toadfish gills, is inserted in the vesicle. Subsequently, it could serve to either sequester cytosolic urea that ultimately is secreted into the water after contact of these vesicles with the pavement cell apical membrane, or it could allow facilitated diffusion of urea across the plasma membrane following insertion into the membrane.

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Authors: LAURENT P, Centre d'Ecologie et de Physiologie Energetique, CNRS, Strasbourg (FR);CHEVALIER C, Centre d'Ecologie et de Physiologie Energetique, CNRS, Strasbourg (FR);WANG Y, Department of Kinesiology, University of Waterloo, Ontario (CA);WOOD C.M, Department of Biology, McMaster University, Ontario (CA);WEST M, Department of Biology, McMaster University, Ontario (CA);PERRY S.F, Department of Biology, University of Ottawa, Ontario (CA);GILMOUR K.M, Department of Biology, Carleton University Ottawa, Ontario (CA);PART P, EC-JRC, Environment Institute, Ispra (IT);WALSH P.J, Division of Marine Biology and Fisheries, NIEHS Marine and Freshwater Biomedical Sciences Center, Rosenstiel School of Marine and Atmospheric Science, University of Miami (US)
Bibliographic Reference: An article published in: Cell Tissue Res. (2001) vol.303,pp.197-210
Record Number: 200013552 / Last updated on: 2001-07-25
Original language: en
Available languages: en
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