A retrograde tracer (Fluorogold) labels neurons within a graft of embryonic spinal
cord that had been placed in the injured spinal cord of an adult rat. The tracer
was placed more than 5 spinal cord segments
away from the transplant, suggesting that neurons from embryonic CNS grafts are
able to extend axons into
the host spinal cord.
Tim Himes, Spinal Cord Research Group.