Assertion: microtubule | /r/CapableOf | polymerize in the presence of kinesin-5
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Source sentences:
text: For microtubules polymerizing in the presence of kinesin-5, 72% of microtubules (34 out of 47) had curved tip structures, while no microtubules grown in the presence of kinesin-1 (0 out of 38) had curved tip structures.