Pig lung transplants one step closer

The Melbourne Herald Sun reports development of pig lungs compatible with human blood. Such organs could fill a real need; 200 died last year on waiting lists in Australia alone.

The genetically-modified pigs do not express a certain antigen that causes the blood to clot. Research on such "knock-out" pigs has been going on for over two decades.

There is an ongoing debate about the ethics of creating such "chimeras." Still, replacement of human heart valves with pig valves or cow cardiac tissue is already widespread.