In the second phase called "Prophase", the process of Mitosis begins. Other than that, the chromatin in the nucleus shortens, and forms chromosomes. If you were to observe this happen under a microscope, you can NOW see the rod like structures. Not the thread like chromatin. At this time, the two centrioles (usually only found in animal cells), move to the opposite ends of the cell. In addition, they form the spindle fibers between the opposite ends of the cell. Near the end of this phase, the nuclear membrane surrounding the nucleus breaks down. Same thing with the nucleolus.

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