In the fourth phase called "Anaphase", the centromere that holds the two sister chromatids together, splits alllowing the sister chromatids to separate from one another. One chromatid from each pair then begins to move to the other end of the cell along the spindle. In other words, the chromatids in a pair separate and each sister chromatid goes to the opposite end of the cell. At this point, the chromatids are again called chromosomes.

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