Figure 4From: Particles induce apical plasma membrane enlargement in epithelial lung cell line depending on particle surface area dose Electron micrographs of the apical plasma membrane of A549 cells. A: Control experiments without particle exposure. B: Exposure to 6 × 108 1 μm particles. Note the changes in APM in comparison with A. Numerous particles (P) taken up by the epithelial cells are found inside the cells. N = Nucleus. Scale bar = 5 μm.Back to article page