, Chloé Dominici 1 , Pavol Zelina 1 , Quentin Rappeneau 1 , Stéphane Fouquet 1 and Alain

R. Moreau, Correspondence: Dr Alain Chédotal, p.153462502

, e-mail: alain.chedotal@inserm.fr

, Running title: The migration of precerebellar neurons does not require Robo Keywords: cerebellum, inferior olive, floor plate, Roundabout, Slit, migration Number of Figures: 10; Number of pages: 32 Number of words : Abstract, Introduction, Discussion Conflict of interests : none Acknowledgments

, François Brunet for providing mouse lines. C.D was recipient of a fellowship from the "Fondation pour la Recherche Médicale" (FRM), the Agence Nationale de la Recherche

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À. Slit1, FR axons from two large commissures: a rostral one (1) and a caudal one (2). A small tract leaves the rostral commissure to grow along the floor plate (arrowheads in M and N). In the second case (O), three commissures are observed, Slit2 lox/lox ;Slit3 À/À embryos (#1 and #2)

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