Representative transverse sections of lesion epicenter sacrificed at 42 dpi stained with euriochrome cyanine for myelin SCI No Allodynia (A), SCI Allodynia (B), SCI No Allodynia +Delayed Ex (E), SCI Allodynia + Delayed Ex (F). Sections from SCI rats sacrificed at 56 dpi in groups SCI No Allodynia (C), SCI Allodynia (D), SCI No Allodynia +Delayed Ex (G), SCI Allodynia + Delayed Ex (H) are also presented. The 200 kdyn impact produced a moderate, lateralized lesion with near complete degeneration of grey matter and a spared rim of white matter on the right side of the spinal cord. Importantly, the grey and white matter of the contralesional spinal cord does not exhibit any overt loss of grey or white matter. (Scale bar = 1.0 mm). There were no significant differences in tissue sparing at the lesion epicenter between any groups (I).