Scientists have been able to grow a beating heart in the lab:

Scientists have created a beating heart in the laboratory in a breakthrough that could allow doctors one day to make a range of organs for transplant almost from scratch.

The procedure involved stripping all the existing cells from a dead heart so that only the protein skeleton that created its shape was left. Then the skeleton was seeded with live progenitor cells, which multiplied and grew back over it, eventually linking together into a new organ. Such cells are involved in the formative stages of specialised types of tissue such as those found in the heart.

So far this has only been done with rats and pigs. And any research in humans is still likely years away. But come on, can any ESC researchers boast of such a breakthrough, even in animals?

H/T: Wesley Smith