MONKEY embryos have been cloned for the first time and used as a source of embryonic stem cells. Researchers should now be able to test stem cell therapies on non-human primates, before testing on humans.
Ever since 1997, when the world learned of Dolly the sheep, researchers have been trying to clone non-human primates. Then in February a South Korean team made headlines when they cloned a human embryo using a new, gentler method that involved coaxing embryos to develop to the blastocyst stage (Â鶹´«Ã½, 21 February, p 6). Embryos at this stage can yield embryonic stem cells…
