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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.
The phases of the cell cycle occur in meiosis as well as mitosis; you will see later how they differ. The length of time of the cell cycle varies among organisms and among cell types. Later in this laboratory you will calculate the length of time a cell spends in several phases of the cell cycle.