title: [Ulstrastructure of Xenopus heart primordia, differentiated in culture in the presence of actinomycin D].
abstract: The cellular differentiation of Xenopus laevis cardiac primordia, developed in vitro with actinomycin D, was studied in fine structure. The ultrastructural changes appeared in mitochondria, and in nucleus, which showed a nucleolar characteristic segregation.
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects*; D002466:Cell Nucleolus / Q000648:ultrastructure; D003609:Dactinomycin / Q000494:pharmacology*; D004477:Ectogenesis; D006321:Heart / Q000196:embryology*; D008854:Microscopy, Electron; D008931:Mitochondria, Muscle / Q000648:ultrastructure; D009206:Myocardium / Q000378:metabolism / Q000648:ultrastructure; D012335:RNA, Ribosomal / Q000096:biosynthesis; D014981:Xenopus
chemical_list: D012335:RNA, Ribosomal; D003609:Dactinomycin
vernacular_title: Etude ultrastructurale des ébauches cardiaques de Xénope, différenciées en culture en présence d'actinomycine D