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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.
Structurally, telomeres are formed by non-coding DNA sequences along with specialized proteins that act as protective caps at the physical ends of chromosomes. Human telomeric DNA consists of repeated sequences of TTAGG and extends over several thousand base pairs.