Telomere
A telomere is the end of a chromosome. Telomeres are made of repetitive sequences of non-coding DNA that protect the chromosome from damage. Each time a cell divides, the telomeres become shorter. Eventually, the telomeres become so short that the cell can no longer divide. Courtesy: National Human Genome Research Institute
Source: .
http://www.genome.gov/
http://www.genome.gov/
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