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Fig. 4. DiI labelling of motor axon pathways in the hindbrains of E11.5 mouse embryos mutant for Slit proteins or Robo proteins. All panels show flat-mount hindbrains with DiI labelling of dorsally projecting BM/VM neurons. (A,E) DiI labelling is bilateral; (B-D,F-H) labelling is unilateral (right-hand side). Genotypes as labelled. Rhombomeres are numbered, white arrowheads indicate floor-plate borders and red arrows indicate axon guidance errors. (A,B,F,I) Floor plate is to left of the white arrow. (H) Basal plate with floor plate towards the left (asterisk). (J) Centre of floor plate. IEE, inner ear efferent axons. Scale bar: 200 µm in A,G; 400 µm in B-F,H.