Figure 4

Immunoreactivity for GAP-43. A. POD 3 (40x), B. POD 5 (40x), C. 1 Week post-PH (40x), D. 2 weeks post-PH (40x), E. 1 month post-PH, F. 3 months post-PH, G. 6 months post-PH. No immuno-positive nerves at POD 3 and expression of GAP-43-positive fibers at POD 5 with increased density at 1 and 2 weeks and 1 and 3 months post-PH, in the form of dots (arrows) and nerve bundles (arrows at F).