(D) Representative images of Slug (red) expression in bronchial epithelial cells (EpC), fibroblasts (Fib) (vimentin in green) macrophages (Mф, CD68 in green) pulmonary vascular endothelial cells (EC, von Willebrand Factor in green) and pulmonary vascular smooth muscle cells (SMC, aSMA in white); and quantification. 