Treated human stem cells transplanted into a laboratory animal. The cells have differentiated to produce proteins occurring in human pancreatic cells. Colors: pink for insulin, yellow for glucagon, blue for nuclear DNA. Credit: Rocio Sartori Maldonado Cell therapies could help in the treatment of hereditary diseases, myocardial infarction and hundreds of other diseases. For many blood diseases, new cells can already be transplanted into human patients, and diabetes has also been treated by trans...