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Scientists have created the world’s first human-sheep hybrid which has the body of a sheep but organs which are half-human. The animal was created by using a technique which involves injecting human cells into a sheep’s foetus, with the result being an animal with 85 per cent sheep cells and 15 per cent human cells. While medical scientists hope this technique will pave the way to grow vital organs in animals which will be transplantable to humans, other scientists warn that “silent viruses” -- which are harmless in animals -- may create new diseases if they are 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." (The Mail)