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Live-cell imaging of asbestos phagocytosis. Phagocytosis of fluorescently labeled asbestos fibers by RAW 264.7 cells (white arrowhead) was depicted using phase contrast images overlaid with fluorescence microscopy images. Small black arrowheads indicate short fibers. The images are from the field of view shown in Additional file 1, and the numbers in the in the upper left corner indicate time (h: min: sec). Scale bar = 10 μm
