(CNN) For decades, scientists have sought to create red blood cells in the lab -- a "holy grail" that some hoped could ease regional blood shortages, especially for people with rare blood types. As the red blood cells mature, they spit out the nucleus -- the core that houses their DNA -- giving the cells a signature round, dimpled shape. First bloodMany others have attempted to create blood in the lab, using stem cells from umbilical cords and other sources. In 2011, a group of French researchers transfused lab-grown red blood cells -- which grew from stem cells, though not Frayne's endless supply -- into one human. And stem cells could be used to create Type O cells, fit for nearly any patient's IV, Lanza said.

Source: CNN March 28, 2017 19:30 UTC