Ultra structural characteristics of myelination in dorsal white matter of spinal cord at the level of T12-L1 of all groups which were evaluated in this study on Day 56. (b) Low power view reveals the distribution of myelinated axons. Three representative high power photographs show the typical appearance of myelinated axons with extensive myelin sheath wrapped around an axon (a, d, and e). Densitometry of MBP in dorsal white matter of spinal cord at the level of T12-L1 is shown in the left part of any electron microscopy pictures. a = Intact, b = SCI, c = SCI-MO, d = SCI-hUCBSC, e = SCI-MO-hUCBSC. Note. MBP = myelin basic protein; hUCBSC = human umbilical cord blood stem cell; MO = Melissa officinalis; SCI = spinal cord injury.