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(a) PAR polymer formation in human fibroblasts treated with 300 μM H2O2 for 10 minutes in the presence or absence of 1 μM fisetin or 100 nM minocycline which were added 30 minutes before the H2O2 treatment. **P < 0.05 compared to cells treated with 300 μM H2O2. (b) Representative photographs of PAR polymer staining. Arrows indicate examples of PAR polymer positive cells. Magnification: 300x.
