But Ian Wilmut, who created Dolly the sheep, says Advanced Cell's work on cows is encouraging.
As Dr Wilmut points out, that would make transplanting tissues created this way into people too risky to contemplate.
Dr Ian Wilmut, who created Dolly, the world's first cloned sheep, said it took 277 tries to get it right.
Prof Wilmut and his team at the Roslin Institute, near Edinburgh, created Dolly in 1996 and unveiled her publicly early in 1997.
The citation for his knighthood credits Prof Wilmut with "revolutionising" biology through the cloning technique which underpins the science of stem cell technology.
Professor Ian Wilmut is to receive a knighthood for his pioneering work at the Roslin Institute near Edinburgh - including cloning the first mammal.
Last month, Prof Wilmut announced that he was abandoning the cloning of human embryos in stem cell research in favour of a new technique developed in Japan.
"Nuclear weapons are much more dangerous than this, " Wilmut said.
The best-known of the new knights is Professor Wilmut, who is said to have revolutionised biology by successfully pioneering the cloning technique that underpins the science of stem cell technology.
Prof Wilmut now heads the Scottish Centre for Regenerative Medicine at Edinburgh University, which brings together experts from the Institute for Stem Cell Research and scientists and clinicians from Edinburgh University's medical school.
The Roslin Institute's Dr. Ian Wilmut, who pioneered the technique that cloned Dolly from a single mammary cell from an adult sheep, said that while human cloning is theoretically possible, he saw no reason to do so.
That technique for generating embryonic-like stem cells (called induced pluripotent stem cells, or iPS cells) bypassed the need for transferring the cells into eggs, as Wilmut had done, and also averted the ethical issues attached to extracting stem cells from embryos as Thomson had done.
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