Fig. 1From: Hedgehog signaling controls mouth opening in the amphioxusThe expression of Smo and Hh genes in developing amphioxus embryos. a1-a8: Expression patterns of Smo at eight stages of amphioxus development. b1-b10: Expression patterns of Hh at nine stages of amphioxus development. Smo exhibits strong maternal expression in fertilized eggs and early cleavage embryos. Hh gene shows zygotic but no maternal expression. Arrow in b9 indicate the section plane in b10. Scale bar, 50 μmBack to article page