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Subepithelial fibrosis. TEM of normal airway (a) shows the regular and thin basement membrane (bm), and asthmatic airways (b) and (c) show the thickened basement membrane (bm) with bundles of collagen (col) in subepithelial region and airway smooth muscle (asm) hyperplasia. ec, epithelial cell and mf, myofibroblast. Images are at 1950X magnification.
