https://engineering.columbia.edu/news/human-heart-muscle-stem-cells
The resulting engineered tissue is truly unprecedented in its similarity to functioning human tissue,” said Seila Selimovic, director of the NIBIB (National Institute of Biomedical Imaging and Bioengineering) Tissue Chips program, within the National Institutes of Health that funded this research. “The ability to develop mature cardiac tissue in such a short time is an important step in moving us closer to having reliable human tissue models for drug testing.” The better the engineered tissues emulate the human heart, the better they can predict the effects that drugs or environmental factors have on the actual heart tissue of a patient. Having a reliable human tissue model would help make drug development significantly faster, safer, and cheaper.