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Extracellular Na+ dependence of 14C-l-methionine (14C-l-Met) uptake in normal trophoblast (NTB) and diabetic trophoblast (DTB) cells incubated at 37°C with 250 nmol/L 14C-l-Met for 6 minutes, at pH 7.5. NaCl in the preincubation and incubation buffer was isotonically replaced by either LiCl or choline chloride (ChCl) (n = 6-11, from 2 to 3 distinct placenta). Shown is arithmetic mean ± standard error of the mean. *Significantly different from control (NaCl; P < .05).
