Effects of physiological concentrations of ZnCl
on insulin content and insulin secretion. Intracellular insulin content (A), insulin secretion (B), and the insulin secretion/content ratio (C) were assessed after INS-1E cells were stimulated with 5–30 μM ZnCl2 for 24 h in the presence of 11 mM glucose. Data are shown as the mean ± SEM (n = 4). *P < 0.05.