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<p>However, telomeres can be also replenished by an enzyme called telomerase reverse transcriptase.</p>
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<p>Discovery History</p>
<p>In the early 1970s : First recognization of telomere existence by notifying the shorter ends of chromosomes during replication. (Alexei Olovnikov)</p>
<p>In 1975–1977 : Discovering simple repeated DNA sequences located at end part of chromosomes. (Elizabeth Blackburn, Joseph Gall)</p>
<p>In 2009 : Discovering mechanism for protecting chromosomes by telomere and telomerase. (Blackburn, Carol Greider, and Jack Szostak)</p>
<p> This discovery was awarded the 2009 Nobel Prize in Physiology or Medicine.</p>
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