Disappears in prophase and reappears in telophase.
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The nuclear envelope reforms and the nucleoli reappear during telophase of mitosis. This phase marks the end of nuclear division as the newly formed daughter nuclei begin to re-establish their nuclear envelopes.
During prometaphase, the nuclear envelope (membrane) breaks apart. However, some fragments of the nuclear envelope are still visible.
The nuclear membrane dissolves during the prophase stage of mitosis, which is part of the cell cycle. This allows the chromosomes to condense and become visible under a microscope.
Nuclear envelope begins to reappear in the telophase stage of mitosis.
In the telo phase