DON W. FAWCETT / SCIENCE PHOTO LIBRARY DON W. FAWCETT / SCIENCE PHOTO LIBRARY
Color enhanced transmission electron micrograph of a mitochondrial DNA molecule from an oocyte of Xenopus laevis. When disrupted mitochondria are spread by surface tension on a film of water and the liberated DNA is collected on an electron microscope grid, it appears in the form of circular filaments such as that shown here.
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