professor massimo caputo used stem cells to inject directly into finley s heart with a second surgical procedure, in the hope they would help damaged blood vessels grow to increase the blood supply to the left side of his heart. after that, he made a really incredible recovery. what was the percentage function? instead of being around 60, 70%, which is normal, down to, really, ten, 20%, so severely affected. and now he has significantly improved to 40, 50%, so almost reaching the normal capacity. so how does it work? well, it involves extracting stem cells from a placenta bank at nhs blood and transplant in bristol. they are then grown by scientists at the royal free hospital into millions of cells to be injected into finley s heart muscle. these are known as allogneic stem cells, which come from unrelated placentas. but in finley s case they have not been rejected and his heart