Assertion: microtubule | /r/CapableOf | break in the transition zone
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text: Retrograde flow may also have a role in microtubule turnover, as microtubules that are moved rearward through their attachment to filopodial actin bundles often 'buckle' and break in the transition zone where contractile actin 'arcs' predominate21, similarly to what occurs in the convergence zone of migrating cells20,26.