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The arrow is pointing to the dark region, which is condensing chromatin.

© The Entangled Bank
Prophase is a beautiful menagerie of changes that occur in both the cytoplasm and nucleus of the dividing cell. Many consider prophase (versus interphase) to be the first true step of the mitotic process.

In prophase, the chromatin condenses into discrete chromosomes. The nuclear envelope breaks down and spindles form at opposite "poles" of the cell.

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