‘Extraordinary’: Gupta amazed by biologist’s ‘ghost’ heart

Dr. Doris Taylor is developing a groundbreaking way to engineer personalized hearts using a patient’s own stem cells. CNN chief medical correspondent Dr. Sanjay Gupta has more.
Dr. Doris Taylor is developing a groundbreaking way to engineer personalized hearts using a patient’s own stem cells. CNN chief medical correspondent Dr. Sanjay Gupta has more.