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Number of motoneurons in mice injected with PBS, LV-LacZ, LV-mGDNF, or LV-GDNF 30 (A, C) and 90 (B, D) d after transection of the facial nerve. A, B, Nissl staining.C, D, ChAT immunostaining. Motoneuron survival is expressed as the percentage of cells surviving on the lesioned compared with the nonlesioned side. Only GDNF is statistically different from PBS, LacZ, and mGDNF or untreated mice; ***p < 0.001.
