Curr Opin Nephrol Hypertens 1996 Sep 01;55:401-5. doi: 10.1097/00041552-199609000-00004.

Mammalian urea transporters.

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Urea transporters are membrane proteins that mediate rapid, passive movement of urea across cell membranes. Physiological studies have revealed their significant roles in urea accumulation in the kidney inner medulla, and consequently in the urinary concentrating mechanism. Three mammalian urea transporters have been identified and their expression in the kidney was found to occur in a tissue-specific manner. This review discusses our current knowledge with emphasis on the localization and regulation of expression of urea transporters in different physiological conditions.

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