Anaphase
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During anaphase the microtubules appear to shorten and pull the sister chromatids apart. As soon as separation is seen between the sister chromatids the cell is in anaphase. Anaphase is the shortest phase of mitosis.
The first image to the near right is a photograph of a model of an animal cell during anaphase. The photomicrograph to the far right is of whitefish blastula cells. Notice how the sister chromatids have separated and a gap appears at the equator. The chromosomes are the darkly staining bodies.
