Movie S2.

Node of Ranvier when VAMP2 dependent exocytosis in astrocytes was reduced. A z-series through sections acquired by serial block face scanning electron microscopy of a node of Ranvier in the optic nerve from a mouse expressing the dnVAMP2 gene [(gfap)dnVAMP2]. Note the enlarged nodal gap. Accompanies SBSEM section shown in Fig. 2.