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During the process of mitosis, the nucleus moves to each side to help divide the cell. Mitosis is the phase of the cell cycle where a cell divides into two identical daughter cells. The nucleus, which contains the cell's genetic material, must replicate and distribute its contents evenly between the two new cells. This movement of the nucleus to opposite sides of the cell is crucial for the accurate division of genetic material and ensures that each daughter cell receives a complete set of chromosomes.

Protoplasm, centrioles, and histology are not directly involved in the physical division of the cell during mitosis. Protoplasm is the living substance of the cell outside the nucleus, centrioles are organelles that help organize cell division, and histology is the study of the microscopic structure of tissues. Out of these options, only the nucleus plays a central role in the process of cell division known as mitosis.