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Scientists in the UK have infused blood cells grown in a laboratory into people in the first such clinical trial in the world. If proven safe and effective, manufactured blood cells could in time revolutionise treatments for people with blood disorders such as sickle cell and rare blood types, the researchers said. It can be difficult to find enough well-matched donated blood for some people with these disorders, they said. The team, including researchers from the University of Cambridge in the UK, said the blood cells were grown from stem cells from donors. The red cells were then transfused into healthy volunteers. This is the first time in the world that red blood cells that have been grown in a laboratory have been given to another person as part of a trial into blood transfusion, they said. "We hope our lab grown red blood cells will last longer than those that come from blood donors," said chief investigator Cedric Ghevaert, a professor at the University of Cambridge and NHS