DAVID SCHARF / SCIENCE PHOTO LIBRARY DAVID SCHARF / SCIENCE PHOTO LIBRARY
Dividing bacterium. Coloured scanning electron micrograph (SEM) of a Bacillus sp. bacterium undergoing binary fission. This method of asexual reproduction is used by a bacterium to produce a genetically and structurally identical clone, or daughter cell. The two cells are seen here still joined along a transverse section. Separation may occur or continuing fission may produce a chain of cells. Magnification: x17, 500 at 5x7cm size.
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