False-colour transmission electron micrograph of the bacterium Escherichia coli, a normal inhabitant of the human intestine. The pair in the centre are in the act of separating following binary fission, the process by which a bacterium divides in two. Under certain conditions E. coli bacteria may become harmful and cause infection in the intestinal or urinogenital tracts. E. coli is the organism most commonly used in genetic engineering experiments. Magnification: x16,500 at 6x4.5cm size.
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