The evolution of germfree technology and cancer research.
D000375:Aging; D000818:Animals; D004195:Disease Models, Animal; D005856:Germ-Free Life; D006087:Graft vs Host Reaction; D007942:Leukemia, Experimental / Q000628:therapy; D051379:Mice; D009374:Neoplasms, Experimental / Q000382:microbiology*; D051381:Rats