Figure 5From: Zebrafish regenerate full thickness optic nerve myelin after demyelination, but this fails with increasing age Remyelination is impaired in old zebrafish. (A) Electron microscopic analysis of the lesion area in the optic nerves of old (>15 months) zebrafish show thin myelin at 28 dpl and even 3 mpl. (B) The percentage of myelinated axons in old fish recovers to a similar level as in controls and young fish. (p > 0.05, n = 3 fish, Kruskal-Wallis test, Dunn’s post test). (C) G-ratios in old zebrafish at 28 dpl and 3 mpl are higher than in unlesioned controls, indicating thin newly formed myelin following demyelination, confirmed by (D) quantification of average G-ratios at different time points post-lesion (p < 0.05, n = 3 fish, Kruskal-Wallis test, Dunn’s post test). Data from young animals in B and D are repeated from Figure 3 for comparison. Mean ± SEM. Scale bar: A = 1 μm.Back to article page