Fig. 3From: Bronchial Epithelial Cell Matrix Production in Response to Silica and Basic Fibroblast Growth FactorSilica internalization into 16HBE cells. Electron microscope micrographs of 16HBE cells untreated (A) and treated with silica (B) (50 µg/ml) for 24 hr. Uranyl acetate and lead citrate staining. Micrograph B shows silica particle internalized by lung epithelial cells. Original magnification 321,000.Back to article page