title: An electronmicroscopical study of the fusion process of the truncus ridges in chick embryos.
mesh_terms: D000818:Animals; D001011:Aorta / Q000166:cytology / Q000196:embryology*; D002642:Chick Embryo; D008854:Microscopy, Electron; D011651:Pulmonary Artery / Q000166:cytology / Q000196:embryology*