title: "Spontaneous" neoplastic transformation of cells in vitro: some facts and theories.
mesh_terms: D000818:Animals; D002875:Chromosomes; D046508:Culture Techniques; D004624:Embryo Transfer; D005123:Eye; D007239:Infections; D007668:Kidney / Q000196:embryology; D016030:Kidney Transplantation; D009132:Muscles; D009369:Neoplasms / Q000209:etiology*; D011120:Polyomavirus; D012513:Sarcoma, Experimental