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microtubule formation vs. microfilament formation

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rleung:
Hi,

I am just wondering....do microfilaments ever use GTP to polymerize, or do they exclusively use ATP-actin?  Thanks so much!

Ryan

sdekivit:
microtubules use GTP to polymerise and actin uses ATP. Intermediate filaments polymerize by tetramers that are polymerized to a intermediate filament.

rleung:
Thanks for clarifying :)

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