title: Variations of the labelling index in vitro of rat mammary gland in pregnancy and early lactation.
abstract: The labelling index of rat mammary gland during oestrus, pregnancy and early lactation was studied in vitro. The implications concerning the existence of a critical cell division are discussed.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D002455:Cell Division; D004247:DNA / Q000096:biosynthesis; D004971:Estrus; D005260:Female; D007774:Lactation; D008321:Mammary Glands, Animal / Q000502:physiology*; D009924:Organ Culture Techniques; D011247:Pregnancy; D011270:Pregnancy, Animal; D051381:Rats; D013936:Thymidine / Q000378:metabolism
chemical_list: D004247:DNA; D013936:Thymidine