Wagner, M M Changes with age in the hematopoietic system in a cesarean-derived, barrier-maintained colony of Wistar rats. [electronic resource] - Journal of the National Cancer Institute Sep 1976 - 501-8 p. digital Publication Type: Journal Article ISSN: 0027-8874 Standard No.: 10.1093/jnci/57.3.501 doi Subjects--Topical Terms: AgingAnimalsAtrophyBone Marrow CellsFemaleGerm-Free LifeHematopoietic System--physiologyLeukocyte CountLiver--cytologyLung--cytologyLymph Nodes--cytologyLymphatic System--physiologyLymphocytes--physiologyPeyer's Patches--physiologyPrecancerous Conditions--pathologyPregnancyRatsRats, Inbred StrainsSpleen--cytologyThymus Gland--cytology