What is a telomere?

Telomeres are distinctive structures found at the ends of our chromosomes. They consist of the same short DNA sequence repeated over and over again.

  • Telomeres are sections of DNA found at the ends of each of our chromosomes.

  • They consist of the same sequence of bases repeated over and over.

  • In humans the telomere sequence is TTAGGG.

  • This sequence is usually repeated about 3,000 times and can reach up to 15,000 base pairs? in length.

Illustration showing the position of telomeres at the end of our chromosomes. Image credit: Genome Research Limited

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