They also knew that there was a string of DNA at the end of each chromosome called a telomere, which shortened a tiny bit each time a cell divided, like time ticking off a clock. As normal cells go through life, their telomeres shorten with each division until they’re almost gone. Then they stop dividing and begin to die. This process correlates with the age of a person: the older we are, the shorter our telomeres, and the fewer times our cells have left to divide before they die. By the early nineties, a scientist at Yale had used HeLa to discover that human cancer cells contain an enzyme called telomerase that rebuilds their telomeres. The presence of telomerase meant cells could keep regenerating their telomeres indefinitely. This explained the mechanics of HeLa’s immortality: telomerase constantly rewound the ticking clock at the end of Henrietta’s chromosomes so they never grew old and never died. . Rebecca Skloot
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More Quotes By Rebecca Skloot
  1. When he asked if she was okay, her eyes welled with tears and she said, “Like I’m always telling my brothers, if you gonna go into history, you can’t do it with a hate attitude. You got to remember, times was different.
  2. For me, it's writing a book and telling people about this story.
  3. As a result of its investigation, the NIH said that to qualify for funding, all proposals for research on human subjects had to be approved by review boards–independent bodies made up of professionals and laypeople of diverse races, classes, and backgrounds–to ensure that they met...
  4. They also knew that there was a string of DNA at the end of each chromosome called a telomere, which shortened a tiny bit each time a cell divided, like time ticking off a clock. As normal cells go through life, their telomeres shorten with...
  5. Only cells that had been transformed by a virus or a genetic mutation had the potential to become immortal.
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