| | Hybrid embryos get go-ahead
The first kind of hybrid allowed under the bill, known as a chimeric embryo, is made by injecting cells from an animal into a human embryo. The second, known as a human transgenic embryo, involves injecting animal DNA into a human embryo.
The third, known as a cytoplasmic hybrid, is created by transferring the nuclei of human cells, such as skin cells, into animal eggs from which almost all the genetic material has been removed. This is this type of human-animal embryo that is being developed in British universities.
Scientists say that developing these embryos will provide a plentiful source of stem cells - immature cells that can develop into many different types of tissue - for use in medical research.
http://www.guardian.co.uk/medicine/story/0,,2081755,00.html
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