After anesthetization with excessive 20% urethane, the mice were perfused intracardially with phosphate buffered saline (PBS) followed by 4% paraformaldehyde. The dissected spinal cords were fixed in 4% paraformaldehyde, dehydrated in 15% and 30% sucrose PBS solution, and cut into 20 μm coronal sections. Thereafter, the sections were subjected to haematoxylin and eosin (H&E) staining and luxol fast blue (LFB) staining as described previously [27 (link),38 (link)]. The images were taken by Olympus VS120 Virtual Slide Scanner.
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