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{{more footnotes|date=December 2013}}
The '''Kokko and Rector model''' is a theory explaining the mechanism of generation of a gradient in the [[inner medulla]] of the [[kidney]]. Unlike earlier theories explaining the mechanism using counter current mechanism (as is the case in the [[outer medulla]]), the driving force for salt reabsorption is stated to be urea accumulation. It has been proved that counter current mechanism cannot be the case in the [[inner medulla]], since there are no salt pumps, and the [[cell membrane]] is too [[Semipermeable membrane|permeable]] to salt.{{clarify|date=December 2013}}
==History==
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