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4. __Long Arms_________. Most eukaryotic cells spend most of their time in interphase. For example, human skin cells, which divide about once a day, spend roughly 22 hours in interphase. About 90 percent of cells are in interphase. Some cells, such as nerve cells, can stay in interphase for decades.
Mitosis is the most vulnerable period of the cell cycle: relative to interphase, the reproductive capacity of cells is more easily abolished and the cells are more easily killed when irradiated, heat shocked, or exposed to various chemicals during mitosis.