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Pir expression ratio in each organ of Sod1−/− male mice relative to wild-type males. Dots represent the mean expression ratios (fold changes) over the Sod1+/+ and error bars represent the standard errors. Asterisks denote the statistical significance of difference between Sod1−/− and Sod1+/+ (pair-wise fixed reallocation randomization test; **P < 0.01, *P < 0.05). n = 8 animals with each genotype.
