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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.
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