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His reasons include an interesting discussion of something called the Hayflick limit on the number of times a human cell can replicate itself.
A breakthrough in culturing embryonic stem cells occurred in 1998 when James Thomson of the University of Wisconsin discovered a line of so-called immortal embryonic stem cells that do not seem to obey the Hayflick limit.
That observation emerged from the study of immortal cells, which have escaped the Hayflick limit and can proliferate indefinitely in test tubes.