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Mean percentage of TUNEL-positive among TH-positive neurons in primary cultures of rat mesencephalic neurons. Cultures were treated with 3 μm MPP+, 3 μm MPP+, and 100 μmzVAD-fmk, or 3 μm MPP+ and 100 μm zIETD-fmk, and treatments were terminated after 72 hr. **p < 0.01 compared with control cultures. ++p < 0.01 compared with MPP+cultures.
