Fig. 4.

Comparison of axon diameter (Fig. 4-A), fiber diameter (Fig. 4-B), G ratio (Fig. 4-C), myelin thickness (Fig. 4-D), number of myelinated fibers (Fig. 4-E), and axon diameter histogram (Fig. 4-F) among the sham-operation, untreated (control), saline/EPO, EPO/EPO, saline/4-AP, and 4-AP/4-AP groups at 7 days after surgical decompression. The values are given as the mean and SEM. *A significant difference (p < 0.05) when compared with the untreated (control) group. See Appendix for specific significant p values.