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Bar graphs depicting age-associated changes in levels of p21-Arc (P=0.003) (A), nitrotyrosine (P=0.006) (B), cytochrome C (P=0.04) (C), and baseline ROS (P≤0.001) (D). N: numbers, indicating numbers of young versus aged rats per group, are shown in the respective bar graph. ROS, reactive oxygen species.
