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Growth factors expressed predominately in ventral root. Changes in mRNA levels in cutaneous nerve grafts (left column) and ventral root grafts (right column) after denervation, and reinnervation by motor or sensory axons at 5, 15, and 30 d. The abbreviations established in Figure 1 are used to identify the groups. *p < 0.005 compared with denervation alone; **p < 0.005 motor versus sensory reinnervation.
