Briefly explain the steps of cell division in mitosis.

During mitosis, one cell splits apart to form two new identical cells. This splitting apart is known as cell division. Mitosis begins when the nucleus makes duplicate copies of its chromosomes. This duplication ensures that each new cell will inherit all the traits of the original parent cell. The chromosomes move into pairs. Then, these chromosome pairs pull away from each other, allowing the cell to split apart. The two new cells are exactly like the original cell in their structure. Each new nucleus now contains all the original information about the cell's function. After growing, the cell may split again through mitosis.

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during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.