Scientists have identified a molecule that allows special cells from embryos, called stem cells, to multiply without limit. The UK researchers have dubbed the molecule Nanog, after the mythological Celtic land of the ever young. Stem cells found in embryos are special because they can turn into almost any type of cell in the body, whether it is a heart cell, skin cell or brain cell. Research into these cells is expected to lead to revolutionary new treatments for a range of conditions from Parkinson's Disease to heart failure and diabetes. But the work is controversial because it involves using cells taken from embryos. Full article at BBC News