Word: celling
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Dates: during 2000-2009
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...think that would be a huge deal. The scientists, from three private labs in La Jolla, Calif., and Detroit made the clones by a technique called somatic cell nuclear transfer: They took the nuclei from skin cells of adult men, inserted the genetic material into enucleated eggs from female donors, and got the eggs to begin dividing, forming embryos containing stem cells. In principle, replacement tissues grown from those cells would be genetically identical to the men they came from. So they could, in principle, be used to fix failing organs, without any fear of rejection...
...problem, as with every recent stem-cell advance so far, is that the principle and the practice are still awfully far apart. No one doubts that the scientists created cloned embryos - largely because they documented their techniques so carefully and performed confirming tests, but also because they aren't the first to have made clones (British scientists did it two years...
...while they're confident they can create stem-cell lines, they haven't done so yet. That reduces the excitement considerably - and indeed, Doug Melton of the Harvard Stem Cell Institute told the Associated Press, "I found it difficult to determine what was substantially...
With dozens of labs around the world working on the problem, the creation of stem-cell lines from embryos like these will happen sooner or later. But even when they do, scientists will have to learn how to coax them into producing useful tissues. They'll also have to make certain that both the cloning and the coaxing don't damage the cells in a way that make them not just ineffective but lethal. That's the danger with a different form of stem-cell production, announced this past November, in which skin cells are simply genetically reprogrammed to revert...
...beginning of this decade, proved less effective in patients than in mice, giving skeptics yet another reason to doubt the approach. But that agent, dismissed by U.S. researchers, eventually won approval in 2005 for treating lung cancer in China, where it is extending the lives of non-small-cell lung cancer patients...