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Stabilizing Microtubules and Microfilaments

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In an actin assembly and a microtubule polymerization, when an ATP/GTP cap is formed, what is meant by "stabilizing" the microtubule or microfilament? Does it stop polymerization and prevent the microtubule or microfilament from continuing to grow or does it just prevent it from falling apart as easily as if the cap was not there? Does polymerization pause if a large ATP/GTP cap forms so that hydrolysis can "catch up"?

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Brief description of microtubule and microfilament polumerization.

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Polymerization still occurs in these stable structures in the GTP ...

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