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Transmission electron micrograph of a macrophage from a human tumour. Macrophages are large scavenger cells which form part of the body's defence system. Their most important function is the engulfment and digestion of invading bacteria, viruses, protozoans, and of cells and cell debris resulting from inflammation or damage. Once engulfed, material is enclosed within single- membraned vacuoles called lysosomes (dark granules, bottom), where it is broken down by hydrolytic enzymes. The large amorphous structure at left is the cell nucleus. Numerous fine hair- like processes are seen protruding from the cell surface. Magnification: x14,000 at 8x10 inch size.
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