Fig. 2

mOLs from donor adult zebrafish rewrapped axons in the host fish at 3 mpt. a-c Two nuclei were found in an olig2⁺ cell at 5 dpt (single focus), which suggests that olig2⁺ cells could proliferate in the host zebrafish. d-e Olig2⁺ cells from the donor optic nerve survived in the host (d) and remyelinated along the whole optic nerve (e). f-h MBP staining showing that olig2⁺ processes were mature myelin processes (single focus). i-k In the cross-section, olig2⁺ cells in the host fish rewrapped regenerated axons (arrows). Scale bars: 10 μm (a-c, e), 100 μm (d), 5 μm (f-h); 2 μm (i-k). The left side in (d-h) represents the proximal segment