Researchers from Tel Aviv University in Israel unveiled a 3D printed heart with human tissue and vessels. Fatty tissue taken from patients in a biopsy was used to create the “ink” for the printout of the heart. Calling it a “major breakthrough”, scientists say they hope the technology could produce hearts suitable for transplant into humans as well as patches to repair or regenerate defective hearts. Among the challenges that remain is finding a way to generate enough cells to create the…