These rats can run.
Run, rats, run.
It’s not graceful movement. Not even for a rat. But it keeps them going in ways their compatriots in a nearby cage cannot match. Those rats are lame, butt-dragging, disabled – as the running rats were not too long ago. Both groups were precisely injured. The damage to their spinal columns mimicked a kind of injury common in humans. Then, a week later, some of the rats received an injection of special cells, cells made from human embryonic stem cells. Those rats run.