title: [Cytological research on the argentophilic nucleolus-organizer regions of the metaphase chromosomes in parthenogenetic mouse embryos].
abstract: Silver staining technique visualizing argentophilic nucleolus organizer regions (Ag-NORs) was used for studying parthenogenetic mouse embryos produced by artificial activation of oocytes in Ca(2+)-Mg(2+)-free medium. Ag-NOR-containing chromosomes were detected in metaphases of parthenogenetic embryos during six successive cleavage divisions starting with the two-cell stage. The frequency of metaphases with varying AG-NOR number in diploid parthenogenones was similar to that in the control (fertilized) embryos. Average number of metaphase Ag-NOR chromosomes (calculated per diploid chromosome set) in haploid parthenogenones exceeded that in the control; in some cases all NORs were stained by silver. This is evidence that latent ribosomal cistrons in some chromosomes can be activated.
authors.forename: A P
authors.initials: AP
authors.lastname: Dyban
authors.forename: E L
authors.initials: EL
authors.lastname: Severova
authors.forename: E M
authors.initials: EM
authors.lastname: Noniashvili
mesh_terms: D000818:Animals; D004171:Diploidy; D047108:Embryonic Development; D005260:Female; D006238:Haploidy; D008677:Metaphase; D051379:Mice; D008810:Mice, Inbred C57BL / Q000196:embryology*; D008808:Mice, Inbred CBA / Q000196:embryology*; D009697:Nucleolus Organizer Region / Q000648:ultrastructure*; D010312:Parthenogenesis; D011247:Pregnancy; D012834:Silver; D013194:Staining and Labeling / Q000379:methods
chemical_list: D012834:Silver
vernacular_title: Tsitologicheskoe issledovanie argentofil'nykh iadryshkoobrazuiushchikh raĭonov metafaznykh khromosom u partenogeneticheskikh zarodysheĭ mysheĭ.