Cellular-level Motility
At the cellular level, different modes of motility exist:
- flagellar motility, a swimming-like motion (observed for example in spermatozoa, propelled by the regular beat of their flagellum, or E. coli, which swims by rotating a helical prokaryotic flagellum)
- amoeboid movement, a crawling-like movement, which also makes swimming possible
- gliding motility
Many cells are not motile, for example Yersinia pestis at 37 °C, Klebsiella pneumoniae and Shigella.
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