Figure 4: Effect of OFS on NF200-positive nerve fibers in the injured spinal cord of SCI rats (immunohistochemical staining). NF200-positive axons and neuron spots (brown) were more numerous and thicker in the OFS + SCI group (A) than the SCI group (B) on Week 12. Arrows indicate NF200-positive axons and neurons. Scale bars: 50 μm. (C) Axon count. All values are expressed as the mean ± SD (n = 20). ***P < 0.001 (independent samples t-test). NF200: Neurofilament-200; OFS: oscillating field stimulation; SCI: spinal cord injury.