Explain the process of tissue cultures using healthy cells.
To create a tissue culture, healthy cells are taken from a living organism and placed in a nutrientrich medium. These cells divide and reproduce through mitosis. They continue to grow and divide until they touch each other, a process known as contact inhibition. As a result, healthy cells form a layer one cell thick and then stop reproducing. Typically, normal cells undergo between 20 and 50 mitotic divisions in a culture before they permanently stop dividing.
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