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Significant changes in expression of epithelial and mesenchymal markers on oropharyngeal aspiration administration of bleomycin. (a) E-cadherin, (b) α-Smooth muscle actin and (c) vaimentin, and (d) ?bronectin, respectively, and respective densitometric analysis were normalized with β-actin. *P < 0.05, **P < 0.01, ***P < 0.001, ****P < 0.0001 of bleomycin versus control
