The mechanism of anaphase spindle elongation.


At anaphase chromosomes move to the spindle poles (anaphase A) and the spindle poles move apart (anaphase B). In vitro studies using isolated diatom spindles demonstrate that the primary mechanochemical event responsible for spindle elongation is the sliding apart of half-spindle microtubules. Further, these forces are generated within the zone of microtubule overlap in the spindle mid-zone.


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