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'''Actin''' is a [[helical]] [[protein]] that forms [[microfilament|microfilaments]]. It is an essential element of the [[cytoskeleton]] of a [[biological cell]]. Actin binds GTP, allowing the filaments to extend and contract rapidly, with a force of up to 200 piconewtons.
'''Actin''' is a [[helical]] [[protein]] that forms [[microfilament]]s. It is an essential element of the [[cytoskeleton]] of a [[biological cell]]. Actin binds GTP, allowing the filaments to extend and contract rapidly, with a force of up to 200 piconewtons.
[[Category:Biology]]
[[Category:Biology]]