title: Xenotransplantation: promising advances cause excitement, uneasiness.
mesh_terms: D000818:Animals; D005818:Genetic Engineering / Q000662:veterinary*; D006084:Graft Rejection / Q000276:immunology*; D006801:Humans; D013552:Swine; D014183:Transplantation, Heterologous / Q000379:methods*