title: The cyclic changes and structure of the base of the aortic valve.
mesh_terms: D000818:Animals; D001011:Aorta / Q000166:cytology; D001021:Aortic Valve / Q000502:physiology*; D003094:Collagen / Q000502:physiology; D003971:Diastole; D004285:Dogs; D004547:Elastic Tissue / Q000502:physiology; D006321:Heart / Q000502:physiology; D006350:Heart Valve Prosthesis; D009200:Myocardial Contraction; D013599:Systole; D013997:Time Factors
chemical_list: D003094:Collagen