Polyspecific transport systems in the kidney mediate the excretion and reabsorption of organic cations. Electrogenic import systems and electroneutral export systems in the basolateral and luminal plasma membranes of proximal renal tubules are involved. Two subtypes of electrogenic import systems have been cloned from rats and humans and functionally characterized.
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Koepsell et al. (1998) studied this question.
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