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Longest phase of the cell cycle

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DNA replication

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DNA in the form of chromatin

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Cell is doing its job

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Cytoplasm is cut in half, forming two daughter cells

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Chromatids reach the poles and uncoil to become less visible

Spindle fibers disappear

Nuclear membrane re-forms

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Spindle fibers shorten

Chromatids of each chromosome separate and are pulled apart

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Chromosomes (each with two chromatids) line up along the middle of the cell

Spindle fibers attach to each chromatid at its centromere

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Chromatin condenses into visible chromosomes

Nuclear membrane disintegrates

Centrioles move apart

Spindle fibers form