Feature Genetics

Year in Review: Caffeine triggers cloning advance

Human embryonic stem cells copied successfully

CELL MAKER  Using a tiny needle and guided by a laser, researchers extract the DNA from a human egg. It’s the first step in a cloning procedure developed to create human embryonic stem cells.

Courtesy of M. Tachibana

By Meghan Rosen

- More than 2 years ago

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With a tweak to the technique that cloned a sheep in 1996, scientists have generated stem cells in the lab that genetically match those found in human embryos.