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Fig. 8. Belladonna regulates Vax gene expression in the preoptic area. Anterior is to the left in the dorsal views of heads of noi-/- (noi) (A,B), shh-injected noi-/- (noi+shh) (C,D), bel-/- (bel) (E,F), and shh-injected bel-/- (bel+shh) (G,H) embryos. Note that the expression of Vax genes is reduced in the preoptic area but not in the optic stalk and ventral retina of bel-/- embryos (E,F, compare with Fig. 2G,J). Abbreviations: os, optic stalk; poa, preoptic area; r, retina.