THE HAYFLICK LIMIT. “Dr. Hayflick noticed that cells grown in cultures reproduce by dividing. They produce facsimiles of themselves (by a process known as mitosis) a finite number of times before the process stops for good and the cell dies. In addition, cells frozen during their lifetimes and later returned to an active state had a kind of cellular memory: The frozen cells picked up right where they left off. In other words, interrupting the cells’ life span did nothing to lengthen it.”
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