In a study published in the January issue of the journal CIRCULATION RESEARCH, researchers at Technion-Israel Institute of Technology reported creating new heart muscle tissue using human embryonic stem cells. The tissue, complete with its own blood vessels, could eventually be used to replace damaged cardiac tissue after a heart attack. The muscle was created from a three-dimensional, sponge-like plastic scaffold, which was then seeded with heart muscle cells and blood vessel cells produced from stem cells.