Rapid stretch injury-induced fluctuations of intracellular zinc ion concentrations in PC12 cells. Intracellular zinc ion concentrations were measured fluorimetrically with 0.3 μM FluoZin-3 AM in 1 ml DPBS without Ca2+ and Mg2+ at 37 °C for 30 min at 0, 0.5, 1, 3, 6, 12 and 24 hours after RSI. Data are represented as mean ± SD (n = 3, p < 0.005 by one-way ANOVA).