Fig. 6.

Increased number of unmyelinated axons in RegIIIβ KO mice. Electron micrograph of the medial hypoglossal nerve of RegIIIβ wild-type (A) or RegIIIβ KO (B) mice. There is an increase in the number of unmyelinated fibers in the lateral and medial hypoglossal motor nerve of RegIIIβ KO mice (n = 8 in each group). (C) No differences were observed in the oculomotor nerve (n = 3 in each group). The data show means ± SEM. **, P < 0.001; ***, P < 0.0001. All nerves were studied at P5. [Scale bar, 2 μm (A and B).]