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By Regina Bailey, About.com Guide to Biology since 1997

What are Cilia and Flagella?

Friday May 2, 2008
Cilia and flagella are protrusions from some cells that aid in cellular locomotion.

If the protrusions are short and numerous they are termed cilia. If they are longer and less numerous (usually only one or two) they are termed flagella.

Both cilia and flagella are found in many types of cells. The sperm of many animals, algae, and even ferns have flagella.

Cilia can be found in areas such as the respiratory and female reproductive tracts.

For more information, see:

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