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Representative images showing TUNEL staining (green) with propidium iodide nuclear counterstaining (red) in the three groups (A) at day 10 after transduction. The number of TUNEL-positive cells was 50% less in the GDNF transduction group compared with the nontransduction group (B, Dunnett's test, P < 0.01). There were no significant differences between the non-transduction and the eGFP transduction groups (B, Dunnett's test, P > 0.05). Scale bars, 50 μm.
