title: Senescence in germfree rats.
mesh_terms: D000375:Aging; D000818:Animals; D036861:Delivery, Obstetric; D005856:Germ-Free Life; D007938:Leukemia / Q000662:veterinary; D008722:Methods; D051381:Rats; D011919:Rats, Inbred Strains / Q000502:physiology*; D012376:Rodent Diseases / Q000209:etiology