Guest guest Posted August 2, 2005 Report Share Posted August 2, 2005 http://www.nytimes.com/2005/08/02/science/02cell.h tml?ex=1123646400 & en=d9f6fc125dea3e41 & ei=5043 & partner=EXCITE http://tinyurl.com/72zlz An interesting quote about cell aging in this article: " But if the body remains so perpetually youthful and vigorous, and so eminently capable of renewing its tissues, why doesn't the regeneration continue forever? Some experts believe the root cause is that the DNA accumulates mutations and its information is gradually degraded. Others blame the DNA of the mitochondria, which lack the repair mechanisms available for the chromosomes. A third theory is that the stem cells that are the source of new cells in each tissue eventually grow feeble with age. " The notion that stem cells themselves age and become less capable of generating progeny is gaining increasing support, " Dr. Frisen said. He hopes to see if the rate of a tissue's regeneration slows as a person ages, which might point to the stem cells as being what one unwetted heel was to Achilles, the single impediment to immortality. " Quote Link to comment Share on other sites More sharing options...
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