The use of electrons instead of photons (light) to get an image of a particularly small subject. While the limit of resolution of a visible light (normal) microscope is about 200 nm, the limit of resolution of an EM is roughly 2 nm (or 20 angstroms).
Two major methods of electron microscopy used in cell biology are rotary shadowing and cryo-electron microscopy. See also: Scanning Electron Microscopy, Tunneling Electron Microscopy, deconvolution, and confocal.

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