Country: United States
Date: November 2008
Why don't cells continue to grow indefinitely?
Every time a cell divides, the tips of the chromosomes (telomeres) are
shortened until the chromosomes can no longer replicate thus ending the
cells ability to divide. This takes about 50 cell divisions and is one of
the causes of aging. This process does not occur in cancer cells or sex
cells and that is why they are immortal.
Ron Baker, Ph.D.
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Update: June 2012