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The movement for this is primarily generated by the action of kinetochores, and a subclass of microtubule called kinetochore microtubules.

The second motion, anaphase B, involves the separation of these poles from each other. The movement for this is primarily generated by the action of interpolar microtubules and astral microtubules.

Anaphase A

A combination of different forces have been observed acting on chromatids in anaphase A, but the primary force is exerted centrally. Microtubules attach to the midpoint of chromosomes

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