Lab grown; artificial blood.
"The potential for this work to benefit hard to transfuse patients is very significant."
Blood that has been grown in a laboratory has been put into people in a world-first clinical trial, UK researchers say.
Tiny amounts - equivalent to a couple of spoonfuls - are being tested to see how it performs inside the body.
Most blood transfusions will still rely on people regularly rolling up their sleeve to donate, but the ultimate goal is to create vital, but ultra-rare, blood groups that are hard to get hold of.