MICHAEL J DALY / SCIENCE PHOTO LIBRARY MICHAEL J DALY / SCIENCE PHOTO LIBRARY
Radiation resistant bacteria. Coloured scanning electron micrograph (SEM) of four Deinococcus radiodurans bacteria forming a tetrad. This extremophile bacteria that can withstand extremes in radiation, low temperature, dehydration, vacuum and acidity. It can survive up to 3,000 times the radiation dose that would normally kill a human. It is thought that high levels of manganese help protect DNA repair proteins within the bacteria.
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