21.   As a result, pig organs transplanted into people are destroyed almost instantly.

22.   Before genetically engineered pig organs are tested in people, researchers will have to convince the Food and Drug Administration that the approach is safe.

23.   But USD Assistant Director Chow Loi hit back by saying the government had banned the supply of pig organs to the market since yesterday.

24.   By removing a gene that causes a swift and powerful rejection by the human immune system, researchers hope that pig organs could be made available to people.

25.   He said people also avoided buying other pig organs, such as the heart and tripe that are not banned.

26.   If an ordinary pig organ is transplanted into a human, the body will destroy the blood vessels and kill it within hours.

27.   In effect, the immune system of the human host is tricked into identifying the pig organ as human.

28.   In many ways, pig organs are likely to be safer than human ones.

29.   Instead, it may be possible to stop antibodies from forming by training the human body to accept a pig organ as its own.

30.   MEAT sellers are afraid shoppers will shy away from pork after the detection of infected pig organs.