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Microtubule behavior after crossing in the cortical array. (A) When a microtubule crosses an existing microtubule, the crossing microtubule but not the existing microtubule is severed. + and – denote the plus and minus ends of a microtubule, respectively. (B) The severed microtubule depolymerizes at the newly created ends. In some cases, the plus end starts to grow by a rescue event.
