Researchers led by Magdi Yacoub, a professor of cardiac surgery at Imperial College London, have grown tissue from stem cells in bone marrow that works in the same way as the valves in human hearts, it said.
We'll see how excited the media gets about this. They usually prefer to downplay any advance in stem cell research that doesn't come from an embryo. However, the most useful advances to date have come from non-embryonic sources. The Church is not opposed to stem cell research per se, only that research which destroys human embryos (read: human life).