Twin speeds

FOR the first time researchers have found that the ends of matching chromosomes can erode at different speeds. Chromosome ends, or telomeres, shorten with every cell division, acting as a biological clock limiting the life of a cell. Jordi Surrallès of Barcelona Independent University led an international team that compared telomere shortening in women’s X chromosome pair, only one of which is active. All the telomeres shortened with increasing age, but the inactive X chromosome’s telomeres shortened far more quickly ( American Journal of Human Genetics, vol 65,
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