Men in sheep's clothing

Scientists in Nevada are cutting foetuses out of sheep, injecting human stem cells into the peritaneum and replacing them in the sheep. The lambs subsequently born have about 15% of human cells which tend to form clusters in the animal, 40% gathering in the liver. They hope to be able to use these livers successfully for transplant operations because the presence of human cells should mean that the organs won't be rejected by a human body unlike previous experiments with pigs' liver transplants which worked for only a few days as there was no similarity of DNA. It is rather a grim thought to think of flocks of designer sheep being bred with human livers. Perhaps they'll advance to human brains at some point. What concerns me is if any of the meat were sold on to unwitting consumers.