Fig. 3

Effects of various inhibitors on relative Δ[Mg²⁺]_i/Δt. Initial Δ[Mg²⁺]_i/Δt was estimated at 25°C in the absence of the inhibitor (control, the leftmost column) or in the presence of (from left to right) 100 µM KB-R7943 (KB-R), 10 µM SEA0400 (SEA), 5 mM NiCl₂ (Ni ²⁺), 200 µM GdCl₃ (Gd ³⁺), 200 µM imipramine (Imip), 5 µM EIPA, 1 mM ouabain (Oua), or 100 µM propranolol (Prop). All values of initial Δ[Mg²⁺]_i/Δt were normalized to those expected for the initial [Mg²⁺]_i to calculate relative Δ[Mg²⁺]_i/Δt. Columns show mean ± SEM from 3–8 cells. Data for ouabain were taken from Fig. 7 of Ref. [4]. **P < 0.01 versus control (the left-most column)