145;Blood converted to universal type146;

Danish researchers have perfected an inexpensive and efficient way to convert types A, B and AB blood into type O, the universal-donor blood that can be given to anyone 8212; an achievement that promises to make transfusions safer and relieve shortages of type O blood. The team reported on Sunday in the journal Nature Biotechnology that they isolated bacterial enzymes that safely remove from red blood cells the sugar molecules that provoke an immune reaction in the recipient.