The neural crest as a fourth germ layer and vertebrates as quadroblastic not triploblastic.
Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada. BKH@is.dal.ca
B K
BK
Hall
D000818:Animals; D009432:Neural Crest / Q000254:growth & development*; D014714:Vertebrates / Q000196:embryology*