title: Histological and ultrastructural observations of tail bud formation in the chick embryo.
mesh_terms: D000818:Animals; D001756:Blastoderm / Q000648:ultrastructure; D002642:Chick Embryo / Q000254:growth & development*; D004475:Ectoderm / Q000648:ultrastructure; D004707:Endoderm / Q000648:ultrastructure; D013116:Spinal Cord / Q000196:embryology* / Q000648:ultrastructure