The mice had been paralyzed because of injuries to their spinal cords.

The researchers used a designer protein injected into the brain.

It re creates a link in the brain that scientists had always believed could not be repaired.

Once broken, the paralyzed mice that received the treatment started walking after two or three weeks.

The team is investigating if the treatment can be improved.

If they are successful working with larger mammals, then the scientists could try the treatment for humans.