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Levels of modified DNA bases in total DNA from brain and hearts of Sod2−/− mice. Open bars, Sod2+/+ and ±; closed bars, Sod2−/−. (a) Modified bases in heart of Sod2−/− mice. n = 6 for control and mutant brains. (b) Modified bases in brain of Sod2−/− mice. n = 6 for controls; n = 7 for mutants.
