title: Structural alterations in tissue cardiac valves implanted in patients and in calves.
mesh_terms: D000818:Animals; D001021:Aortic Valve / Q000601:surgery; D005206:Fascia Lata / Q000601:surgery; D006350:Heart Valve Prosthesis; D006351:Heart Valves / Q000601:surgery* / Q000637:transplantation*; D006801:Humans; D008943:Mitral Valve / Q000601:surgery; D010496:Pericardium / Q000601:surgery; D011183:Postoperative Complications; D013518:Surgery, Plastic; D013552:Swine; D014021:Tissue Preservation; D014183:Transplantation, Heterologous