title: [Regulation of macronuclear DNA content during the cell cycle of the ciliate Tetrahymena paravorax (microstome form)].
abstract: Results of autoradiographic studies of 3H-thymidine incorporation support a model of macronuclear DNA content regulation involving an action upon the extremes of DNA content: elimination of S phase in cells with large DNA content, additional S phase in cells with DNA content. The frequency of each of these phenomena is about 20%: the inequality of frequencies obtained with the two types of sister cells (proters and opisthes) is relatable to the asymetry of cytodieresis observed in this ciliate.
mesh_terms: D000818:Animals; D002453:Cell Cycle; D002467:Cell Nucleus / Q000378:metabolism*; D004247:DNA / Q000378:metabolism*; D007700:Kinetics; D012621:Seasons; D013768:Tetrahymena / Q000502:physiology*; D013936:Thymidine / Q000378:metabolism
chemical_list: D004247:DNA; D013936:Thymidine
vernacular_title: A propos de la régulation de la teneur en ADN macronucléaire pendant le cycle cellulaire du cilié Tetrahymena paravorax (forme microstome).