Avoiding a chimaera quagmire.
D000818:Animals; D002459:Cell Fusion / Q000941:ethics* / Q000379:methods; D002678:Chimera / Q000196:embryology*; D017408:Guidelines as Topic; D006801:Humans; D018570:Risk Assessment; D033581:Stem Cell Transplantation / Q000941:ethics*; D006113:United Kingdom