Figure 2From: Differences in gene expression and cytokine production by crystalline vs. amorphous silica in human lung epithelial cells Interaction and uptake of silica particles by BEAS 2B cells. Scanning Electron Micrographs of BEAS 2B cells. Unexposed controls (A, B), exposed to cristobalite (75 × 106μm2/cm2) for 2 h (C, D), 24 h (E, F) and amorphous silica (75 × 106μm2/cm2) for 2 h (G, H) and 24 h (I, J). Panels on the left are at low magnification (500×) scale bar = 50 μm and on the right at high magnification (2500×) scale bar = 10 μm. White arrows indicate silica particles.Back to article page