Here's an Ambystoma punctatum larva into whose dorsal fin the author grafted an eye and a limb and then spliced them to each other with a short piece of spinal cord. Nerve fibers from the grafted cord (the splicer) grew into the grafted leg (X in the photo) -- shown here pointing toward the floor of the animal's dish; optic nerve fibers from the transplanted eye grew into the piece of spinal cord. Did the eye and leg work? Aim a light at the eye, and the leg would dance to the tempo at which you operated the on/off switch.
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