Telomeres can be found on the ends of all of your chromosomes and located in the region of the repeated nucleotides (the A, G, and T's). They cap off the end of the chromosomes, protecting the nuclear DNA during replication before cell division. [ref]
Why are telomeres important?
Each time a cell divides, it makes a copy of the nuclear DNA and a little bit of the telomere is lost. When DNA replicates, it can't replicate the very end part of the chromosome, where the telomere is located.
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