You look in the microscope and see sister chromatids moving to opposite sides of the cell.You conclude the cell is in:

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Sister chromatids moving to opposite sides of the cell is a defining characteristic of anaphase. In metaphase, the chromosomes are aligned in the center of the cell and have not yet started to separate. In prophase, the chromosomes are condensing and the spindle fibers are forming, but the chromatids have not yet started to separate. In telophase, the chromatids have fully separated and distinct nuclei are forming at opposite ends of the cell. Interphase is the period of the cell cycle between cell divisions where the cell is actively growing and carrying out normal cellular functions.

You Look in the Microscope and See Sister Chromatids Moving