Tiny fibers that form during cell division; the fibers attach to the centromeres of chromatid pairs during metaphase and contract to separate each pair during anaphase, at which time the chromatids become chromosomes.

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1. Tiny fibers that form during cell division; the fibers attach to the centromeres of chromatid pairs during metaphase and contract to separate each pair during anaphase, at which time the chromatids become chromosomes.
Image: Spindle