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Increased n-tyrosine staining in 2-week-old CS-exposed lung. (A) Increased n-tyrosine expression in 2-week-old CS-exposed lung (black arrows point to brown staining). (B) n-Tyrosine staining was significantly increased in 2-week-old CS-exposed lung compared with 2-week-old control lung (*P < 0.03 by Wilcoxon rank sum test; 2-week-old CS n = 6, 2-week-old control n = 4, adult control n = 3, and adult smoke n = 5, ± SEM).
