Porcine heterograft heart valves.
D000818:Animals; D006349:Heart Valve Diseases / Q000601:surgery*; D006350:Heart Valve Prosthesis; D006351:Heart Valves / Q000637:transplantation*; D006801:Humans; D013552:Swine; D014183:Transplantation, Heterologous / Q000379:methods*