1.   A second kind of human embryonic stem cell appears to have demonstrated promise in repairing damaged tissues by helping paralyzed mice regain some powers of movement.

2.   Research has proven that stem cells taken from mice embryos can be injected into the spinal chords of paralyzed mice and spark recovery.

3.   Scientists have successfully spliced pig cells into the injured spines of paralyzed mice and restored some nerve impulses.

4.   Yale scientists announced last year that they found some nerve impulses were restored in paralyzed mice that had pig cells spliced into their spines.