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Time-dependent 5-HT uptake into MVM and BM vesicles isolated from human term placentas. 5-HT uptake in the MVM vesicles increased for 15 min, then gradually declined, presumably due to Na+ gradient loss (A). No such effect was detected in the BM vesicles, indicating a Na+-independent mechanism (B). Data are median + IQR (n = 5 donors) for each membrane
