To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 3 3D movie of 3DISCO-cleared E13 wild type embryo. All Robo3+ axons are confined to the CNS. Abbreviations: Ce, cerebellum; Hind, hindbrain; Mes, mesencephalon; Fr; Fasciculus retroflexus. Commissural neurons transgress the CNS/PNS boundary in absence of ventricular zone-derived netrin 1 Juan Antonio Moreno-Bravo, Sergi Roig Puiggros, Heike Blockus, Chloé Dominici, Pavol Zelina, Patrick Mehlen, and Alain Chédotal Development 2018. 145:None-None; doi: 10.1242/dev.159400 Download Original Video