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filopodia
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Definitions of filopodia in various dictionaries:
FILOPODIA - Filopodia (also microspikes) are slender cytoplasmic projections that extend beyond the leading edge of lamellipodia in migrating cells. They contain...
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Possible Dictionary Clues |
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Plural form of filopodium. |
A long, slender, tapering pseudopodium, as found in some protozoans and in embryonic cells. |
Filopodia description |
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Filopodia (also microspikes) are slender cytoplasmic projections that extend beyond the leading edge of lamellipodia in migrating cells. They contain actin filaments cross-linked into bundles by actin-binding proteins, e.g. fascin and fimbrin. Filopodia form focal adhesions with the substratum, linking it to the cell surface. Many types of migrating cells display filopodia, which are thought to be involved in both sensation of chemotropic cues, and resulting changes in directed locomotion. * Activation of the Rho family of small Ras-related GTPases, particularly cdc42 and their downstream intermediates results in the polymerization of actin fibers by Ena/Vasp homology proteins. Growth factors bind to receptor tyrosine kinases resulting in the polymerization of actin filaments, which, when cross-linked, make up the supporting cytoskeletal elements of filopodia. Rho activity also results in activation by phosphorylation of ezrin-moesin-radixin family proteins that link actin filaments to t |