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From: http://en.wikipedia.org/wiki/Hayflick_limit

"The Hayflick limit is the number of times a cell will divide before it stops due to the telomere reaching a critical length.

It was discovered by Leonard Hayflick in 1965, when Hayflick demonstrated that normal human cells in a cell culture divide about 52 times before entering a senescence phase (refuting the contention by Alexis Carrel that normal cells are immortal). Each mitosis shortens the telomere appendix on the DNA of the cell, thus ticking back an "inner clock" for each subsequent copy of the cell."

"Hayflick demonstrated that normal human cells in a cell culture divide about 52 times before entering a senescence phase"

"human cells in a cell culture divide about 52 times"

"52 times"

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