Video S1. 3D movie reconstructed by super-resolution structured illumination microscopy (SIM) imaging of live organotypic mouse cerebellar slices stained with MS#30 (red), then fixed and stained for MAG (blue) and NF-H (purple). MS#30 reactivity was on oligodendrocyte processes, including those contacting adjacent axons, and on myelinated MAG+ axons, outside of MAG layer. Scale bar: 2 μm. Acta Neuropathologica Communications Neuroscience of Disease20175:25 DOI: 10.1186/s40478-017-0428-6