London Telegraph 
June 20, 2011
Human organs could be grown inside pigs for use in transplant operations following research using stem cells.
Scientists have found they can create chimeric animals that have organs belonging to another species by injecting stem cells into the embryo of another species.
The researchers injected stem cells from rats into the embryos of mice that had been genetically altered so they could not produce their own organs, creating mice that had rat organs.
The researchers say the technique could allow pigs to grow human organs from patient’s stem cells for use as transplants.