Word: fetal
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...REST If you use a dietary supplement called Sleeping Buddha, you should stop right away, says the FDA. Marketed as an herbal sleep aid, it actually contains estazolam, a prescription-strength drug that can cause fetal damage if used by pregnant women...
...does that mean all the cloning hoopla Dolly set off was for naught? Not quite. What Wilmut is conceding is that Dolly's mom--or should we say her twin sister?--probably had some fetal cells circulating in her bloodstream, and that one of these fetal cells could conceivably have found its way into the laboratory culture from which Dolly sprang. Cloning an embryo from a fetal cell, of course, would not be as big a deal. What made the Dolly experiment so extraordinary was that Wilmut had managed to get the DNA of an adult cell to revert...
Wilmut last week put the chances that Dolly was some sort of fetal-cell contamination at less than a million to one. Nonetheless, he and his colleagues are scrambling to track down any other tissue samples taken from Dolly's mom so they can perform the genetic tests that will determine, once and for all, if Dolly's DNA and her mom's DNA are identical...
...should cloning an adult cell be so hard? The cell-cloning technique scientists use offers some clues. Typically, the nucleus of the donor cell, whether fetal or full grown, is transferred to an unfertilized egg from which the nucleus has been removed. In mysterious ways scientists still do not understand, something in the cytoplasm of the egg appears to reset the donor cell's DNA. That resetting, it has been clear from the beginning, works much less reliably when adult cells are used, even when they are relatively immature fibroblast cells...
LOUISVILLE, Ky: Don't tell Dolly, but she may have been a mistake. The Scottish scientist who cloned the world's most famous ewe more than 12 months ago now reports a "remote possibility" that he used a fetal cell to create her rather than an adult cell. What's the difference? About a year's worth of attention from the world press, since scientists have been able to "clone" animals from fetal cells for about two decades now. As Ian Wilmut of Scotland's Roslin Institute sheepishly admitted to a genetics forum at the University of Louisville, fetal cells...