The Mitchison and Kirschner ________ model of how microtubules transition between periods of growth and catastrophe proposes that ________ bound to β-tubulin subunits at a microtubule plus end stabilizes the end and promotes growth,but if the rate of hydrolysis to ________ exceeds the rate of tubulin addition,the end becomes unstable and loses subunits.
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A)α-tubulin;
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