U.S. scientists have found a way to produce stem cells from adults rather than embryos. It is hoped that stem cells could one day be used to repair damaged tissue. However, there had always been an ethical discussion about the harvesting of the stem cells. It was originally tested on cells in mice but then later tried it on humans.
"It was done by using viruses to insert four genes into the cells which prompt the switching on and off of other genes and cause the cells to revert to stem cells." (bbc.com)
But they have now discovered that by adding thiazovivin they doubled that to get 200 times the number of cells.
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