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Tag: "clock" at biology news

Newly Discovered Human Protein Provides Important Target For Cancer Therapy

... collected by many laboratories indicates that the clock orcounting mechanism relies on specialized bits of DNA, called telomeres, at theends of each human chromosome. In the absence of telomerase enzyme, thesespecialized end-structures grow shorter with each round of cell division. Eventually, the shorte...

Research Team Discovers Key Gene For Telomerase Enzyme In Humans

...elomere shortening is thought to act asa molecular clock of sorts by signaling the cell to stop dividing afterrepeated cell divisions. But the telomerase enzyme counteracts telomere shortening by addingDNA back onto the chromosome ends, he said. Normal cells do not containtelomerase, and their tel...

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