Identifying Questions and Hypotheses

           Scientists in the University of Pittsburgh grew human heart tissue out of human stem cells that contracted in a petri dish. They used induced pluripotent stem cells (iPS) from human skin cells. iPS cells can be made to become any cell in the body. After being placed on a non-living "scaffold" of mouse heart cells. It developed into a heart muscle, and after 20 days of blood supply, it began contracting. The experiment was done to help repair damaged cells in the human body. They hypothesized that iPS cells would work just as well as stem cells from an embryo. Previous knowledge they had was how stem cells work from human embryos.

http://news.discovery.com/tech/biotechnology/stem-cells-grow-beating-heart-130814.htm