Researchers from Harvard University have shown progress toward a 3D bioprinting method that could potentially save the lives of those waiting for organ transplants.
Growing organs in the lab is one of the ways regenerative medicine could be applied to more patients.
The study was published in the journal Science Advances, along with a video of the innovative method.
Researchers grew hundreds of thousands of heart stem cells that were molded and packed into organoids, or tissue that mimics a mini-model of an organ.
A special ink made a pattern in the mold of densely packed cells and was later removed, creating channels in the tissue that replicate blood vessels.
The successfully engineered heart tissue then beat for more than seven days.