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A Dictionary of Zoology | 1999 | | © A Dictionary of Zoology 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

spindle The set of microtubular fibres that appear to move the chromosomes of eukaryotes during cell division. The spindle is formed only at mitosis or meiosis, appearing at metaphase and first arranging the chromosomes at its equator. Movement apart of chromatids then occurs during anaphase, probably as a result of the spindle fibres, which run from the centromere (spindle attachment) to the spindle pole and from pole to pole, sliding past one another in a ratchetlike manner, similar to the way muscle filaments slide past each other (see SLIDING-FILAMENT THEORY).

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