title: Proceedings: Early changes in occlusion of the ductus arteriosus.
mesh_terms: D000818:Animals; D004373:Ductus Arteriosus / Q000196:embryology* / Q000502:physiology / Q000648:ultrastructure; D005333:Fetus; D008854:Microscopy, Electron; D011817:Rabbits; D012119:Respiration