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energetic conditions of cell. Therefore, in contrast to chemotaxis (taxis towards or away from a specific extracellular compound), energy taxis responds on an intracellular stimulus (e.g. proton motive force, activity of NDH- 1) and requires metabolic activity.
* Gravitaxis (known historically as geotaxis) is the directional movement (along the vector of gravity) to the center of gravity.

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