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Telomeres are thought to be maintained by the preferential recruitment of telomerase to the shortest telomeres. The extension of the G-rich telomeric strand by telomerase is also believed to be coordinated with the complementary synthesis of the C strand by the conventional replication machinery. However, we show that under telomere length-maintenance conditions in cancer cells, human telomerase extends...
G-rich 3′ telomeric overhangs are required both for forming the distinct telomere structures to protect chromosome ends and for extending telomeres by telomerase. However, little is known about the molecular mechanisms generating telomere overhangs in human cells. We show here that cultured normal human diploid cells have longer G overhangs at telomeres generated by lagging-strand synthesis than by...
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