Fig. 1

Examples of [Mg²⁺]_i recovery with or without naltriben. Each symbol shows the data obtained from individual cells. The black bar on the left-upper side in each panel shows the period of Mg²⁺ depletion. The value of [Mg²⁺]_i at time -20 (min) indicates the basal [Mg²⁺]_i before depletion. After time 0, cells were perfused with the following: a Ca²⁺-free Tyrode’s solution without naltriben, b naltriben at 5 μM, c 50 μM, and d 100 μM. Each solid line in a–c was drawn according to a two-phase exponential fitting of the data set (see “Materials and methods”) with time constants (min) shown in each panel