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But what will they do with the left over embryos??? Challenge to Bush in new stem cell breakthrough Ian Sample, science correspondent in Montreal Monday October 17, 2005 The Guardian Scientists have perfected a way of making embryonic stem cells without destroying the embryos from which they derive, a breakthrough that will challenge George Bush's opposition to the research. The new research, carried out by Robert Lanza at the Massachusetts-based stem cell company Advanced Cell Technology, shows embryonic stem (ES) cells can be created without resorting to the creation of embryos themselves - a process known as therapeutic cloning, which was legalised in Britain in 2001. In work carried out in mice, the researchers let fertilised eggs divide for two to three days until they formed a ball of eight cells. They then removed one of the cells and cultured it in a dish. They found it grew into a mass of cells, some of which turned into ES cells. The remainder of the cells were reimplanted into surrogate mothers and allowed to develop normally. In 48 attempts, foetuses developed in 29 mothers, a success rate comparable to that seen in surrogate fertility clinics, the researchers claim. ---------------------------------------------------------------------- To sign-off Parkinsn send a message to: mailto:[log in to unmask] In the body of the message put: signoff parkinsn