Word: embryos
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...years after the cloning of Dolly had everyone asking if there would ever be another ewe, South Korean researchers are claiming that the answer is yes. Using a technique already performed in Hawaii on mice, two Korean scientists have conducted what may be the first cloning of a human embryo. They implanted genetic material from a 30-year-old woman into an egg cell, and then let that cell divide twice before stopping the experiment to steer clear of a Korean ban on experimentation with more fully developed embryos. "What this represents is a refinement of the Hawaii technique," says...
...point. Cells divide automatically up to four cells, but it's only after they have divided to 16 that you have a pretty good chance that it's going to work," says Thompson. Because the Koreans stopped the experiment well before that point, it's not clear that the embryo would have grown into a full-fledged human. Still, like it or not, several genetically identical cats have just been...
...There his father Jacob Mayer struggled as a junkman. Little Louie, half starved, battled anti-Semitic bullies and helped his father--whom he despised as much as he adored his mother. Escaping St. John in his late teens, he moved on to Boston, where he discovered the Nickelodeon, the embryo of the moving-picture business. Quick to seize his opportunities in the young business of film distribution, Mayer earned a breakthrough $500,000 by putting up $50,000 for a lopsided 90% of the New England ticket sales on the first movie blockbuster, The Birth of a Nation. Now ready...
...fleeting time, a day or two at most, all things are possible for an extraordinary group of cells that form part of a newly created embryo. Known as embryonic stem cells, they have the capacity to grow into any sort of tissue the body will need--nerves, blood, heart, bone and all the rest. And then they start to do just that, abandoning their unlimited promise in order to do something useful with their lives. Scientists have long believed, however, that embryonic stem cells could be terrifically useful in their unspecialized state as well, not only as a source...
...must have done something right. Where Wilmut got only a single cell to flower into an embryo and then a full-term fetus, Wakayama got dozens; up to 3% of his clones survived. That may be in part because his technique treated the cells more gently. It's also possible that injecting just the nucleus introduced fewer contaminants into the host cell...