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The modulation of serotonin uptake kinetics by Na+, Cl-, H+, and K+ was investigated in brush-border membrane vesicles prepared from normal human term placentas. The presence of Na+ and Cl- in the external medium was mandatory for the function of the serotonin transporter. In both cases, the initial uptake rate of serotonin was a hyperbolic function of the(More)
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