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Lateral bonds between protofilaments:

stabilize the microtubule

limit subunit addition and subtraction to microtubule ends

Microtubules are polarized polymers. The plus end is crowned by β-tubulin and assembles faster.

The minus end is crowned by α-tubulin and assembles slower.

7.3 Microtubules are polar polymers of α- and β- tubulin

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