title: Xenotransplantation: the heart of the matter.
mesh_terms: D000818:Animals; D002417:Cattle; D016643:Encephalopathy, Bovine Spongiform; D033161:Government Regulation; D006801:Humans; D011640:Public Policy; D012192:Retroviridae Infections / Q000635:transmission*; D014183:Transplantation, Heterologous; D006113:United Kingdom