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Specialized cells capable of dormancy.

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(a) Akinetes are thick-walled, food-filled cells produced by some cyanobacteria. They are able to resist stressful conditions and generate new populations when conditions improve. As discussed later, the heterocyst is a specialized cell in which nitrogen fixation occurs. (b) An endospore with a resistant wall develops within the cytoplasm of the bacterium Clostridium difficile.
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