Shark embryo sections were immunostained for GFAP (A–C), S100 (D, E), 3A10 (G) and Tuj1 (F). GFAP and S100 both labeled radial glia processes, while S100 also cell bodies in the ventricular zone (magnified insert in D). DRG, sympathetic ganglia (SG), motor axons (Ax) and enteric nervous (ENS) system were all clearly marked with Tuj1 in F.