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Extracellular superoxide dismutase (ECSOD) immunoreactivity in alveolar epithelial cells exposed to transforming growth factor (TGF)- β (A) and tumour necrosis factor (TNF)- α (B) for 24–76 h; the experiments were carried out in duplicate. The expression was standardized against β-actin as described. A, □, Control; ▪, TGF. B, □, Control; ▪, TNF.
