Each time a cell divides, the telomere, or the protective end of a chromosome, erodes. Eventually, the telomere becomes too short to protect the chromosome. When that happens, the cell can no longer divide and eventually dies. By adulthood, most healthy cells no longer contain any telomerase. But 90 percent of cancer cells have been found to have telomerase, raising suspicions that telomerase is linked to cancer.
American companies prepare for European currency switch.
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