Pig lungs in human transplants moves step closer:

- The breakthrough came after scientists were able to remove a section of pig DNA, which had made the pig organs incompatible with human blood
- Previous attempts to combine unmodified pig lungs and human blood ended abruptly two years ago when blood clots began forming almost immediately
- Human DNA is now added to the pigs as they are reared to reduce clotting and the number of lungs which are rejected.