Spindle fibres are made up of

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(C) Spindle fibres are composed of microtubules.Microtubules are cylindrical structures formed by the polymerization of globular protein subunits know

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Alpha & beta tubulin

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(C) Spindle fibres are composed of microtubules.Microtubules are cylindrical structures formed by the polymerization of globular protein subunits known as tubulin.Specifically,these are composed of $\alpha$-tubulin and $\beta$-tubulin dimers.Therefore,spindle fibres are made up of $\alpha$ and $\beta$ tubulin proteins.

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