An experiment in the United States has created a mixed-sex human embyro. The team involved insists that the creation of an hermaphrodite human embryo was designed to cure illness, but critics say moral and ethical standards have been breached. The process would create a "chimaera" - a blend of two embryos, each of which would have a distinct genetic identities. Any attempt to produce such a baby would provoke a worldwide ethical storm. In experiments using donated embryos, scientists from the Centers for Human Reproduction in New York and Chicago have taken the first step - and found that, in some cases, the introduced cells do proliferate and spread throughout the chimaeric embryo.

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