1. Inhibition of Sonic hedgehog signaling in vivo results in craniofacial neural crest cell death;Ahlgren;Curr Biol,1999
2. Marginal zone cells: the primitive streak‐inducing component of the primary hyoblast in the chick;Azar;J Embryol Exp Morphol,1979
3. Identification of Sonic hedgehog as a candidate gene responsible for holoprosencephaly;Bellon;Nat Genet,1996
4. Studies on the cerebral tube in vertebrates: the neuromeres;Berquist;Acta Zool,1952
5. The Human Embryo;Blechschmidt,1964