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Telomere Definition. Telomeres are short tandem repeats of nucleotides at the ends of chromosomes. Let's break this definition down a bit. Nucleotides are the building blocks of DNA, which is the carrier of genetic information.
1 Cells that divide rapidly, such as germ cells and stem cells, are among the few cell types in our bodies containing active telomerase. 2  This means that in these cells telomere length is maintained or even lengthened over time.