It depends on which blood component we've made out of that. If we look at the red blood cells that we use for transfusion, the vast majority of this blood is transfused. A small proportion of it actually outdates, because you can only keep it for 42 days. It may not get used, particularly in some of our smaller hospitals who keep it because they might need it. The discard rates are in low single digits for donated blood.
Research blood is actually donated specifically for research.