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Violin plots of absolute 3-nitrotyrosine levels in serum of all COPD patient groups (A) and delta (post-pre) of serum 3-nitrotyrosine levels in placebo and iron-treated groups (B). The dashed line represents the median and the dotted lines the interquartile ranges. Statistical significance: n.s., no significance; # p < 0.05 between iron and placebo treatment.
