title: Relationships between the wave form of QRS complex and the formation of specific cardiac muscle in the free ventricular wall of several species of vetebrates in developing stage.
mesh_terms: D000818:Animals; D002642:Chick Embryo / Q000502:physiology*; D004285:Dogs / Q000196:embryology*; D004562:Electrocardiography / Q000662:veterinary*; D005333:Fetus; D006321:Heart / Q000196:embryology*; D006329:Heart Conduction System / Q000196:embryology; D006352:Heart Ventricles / Q000196:embryology; D012756:Sheep / Q000196:embryology*