Figure 3.

Baseline expression of growth factors in the normal, uninjured nerves that will serve as the anatomical substrate for denervation experiments: dorsal root, ventral root, cutaneous nerve, and muscle nerve. Expression of each growth factor is measured relative to that of GAPDH, and is graphed as the fold difference between the two on a logarithmic scale. Since GAPDH is expressed in resting Schwann cells at much higher levels than are growth factors, all values are negative.