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Effects of GAE upon the activity of caspase-3, caspase-8 and Na+-K+-ATPase. NGF differentiated-PC12 cells were treated with GAE at 0.25%, 0.5% or 1%, and followed by using H2O2 to induce cell injury. Normal group had no GAE or H2O2. Control group had no GAE, but with H2O2. Data are mean ± sd (n = 7). a-dValues among bars without a common letter differ, P < 0.05.