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While working in her lab, pathologist Lynn Allen-Hoffman discovered a petri dish filled with colonies of skin cellsthat, for some unknown reason, will not die. She was running a routine experiment on the aging of human skin, when shefirst noticed the group of seemingly immortal cells, in the midst of a colony of dead cells.

Most skin cells die within a few weeks, but these cells have been alive for 4 years now, and still show no sign ofdemise.
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