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The P phase, or prophase, is the first stage of mitosis where chromatin condenses into visible chromosomes, each consisting of two sister chromatids joined at the centromere. The nuclear envelope begins to break down, and the mitotic spindle, composed of microtubules, starts to form from the centrosomes, which move to opposite poles of the cell. This sets the stage for the subsequent phases of mitosis, where the chromosomes will align and be separated into two daughter cells.

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1w ago

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