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Number of times a normal human cell population will divide until cell division stops; phenomenon, when fibroblasts can reach a maximum of 50 cell divisions before becoming senescent
The Hayflick limit, or Hayflick phenomenon, is the number of times a normal somatic, differentiated human cell population will divide before cell division stops. However, this limit does not apply to stem cells. The concept of the Hayflick limit was advanced by American anatomist Leonard Hayflick in 1961, at the Wistar Institute in Philadelphia, Pennsylvania. Wikipedia