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In page Microsatellite:

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Telomeres are linear sequences of DNA that sit at the very ends of chromosomes and protect the integrity of genomic material (not unlike an aglet on the end of a shoelace) during successive rounds of cell division due to the "end replication problem".[2] In white blood cells, the gradual shortening of telomeric DNA has been shown to inversely correlate with ageing in several sample types.[7] Telomeres consist of repetitive DNA, with the hexanucleotide repeat motif TTAGGG in vertebrates.[citation needed] They are thus classified as minisatellites. Similarly, insects have shorter repeat motifs in their telomeres that could arguably be considered microsatellites.[citation needed]