In a world-first, scientists at Tel Aviv University have successfully 3D printed a tiny human heart using real human cells.

Miniature organs have a new lifeline. Mimicking the way early human embryos grow blood vessels, scientists nudged multiple types of mini organs to sprout their own vascular networks. Also called ...

EDITOR’S NOTE: Watch “Dr. Sanjay Gupta Reports: Animal Pharm” on Sunday, May 18, at 8 p.m. ET/PT on CNN. There were more than 48,000 organ transplants in the United States last year. They’re ...