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Fig. 6. Hedgehog signals act downstream of the Nodal signalling pathway to induce Vax gene expression. Lateral views of gene expression (indicated bottom right) in 24-hour stage cyc-/- (cyc) (A,B), oep-/- (oep) (C,D), shh-injected oep-/- (oep+shh) (E,F) embryos. Abbreviations: r, retina; t, telencephalon.