Scientists are trying to grow human organs, suitable for transplant into human bodies - in sheep. The "chimera" sheep are 15% human and 85% sheep.
Freaky, right out of some frightening science fiction movie. And at least SOME in the science communities don't think its all that great an idea...
But the development is likely to revive criticisms about scientists playing God, with the possibility of silent viruses, which are harmless in animals, being introduced into the human race.
Dr Patrick Dixon, an international lecturer on biological trends, warned: "Many silent viruses could create a biological nightmare in humans. Mutant animal viruses are a real threat, as we have seen with HIV."
Animal rights activists fear that if the cells get mixed together, they could end up with cellular fusion, creating a hybrid which would have the features and characteristics of both man and sheep. But Prof Zanjani said: "Transplanting the cells into foetal sheep at this early stage does not result in fusion at all."