title: [The ultrastructural patterns of germinal and yolk granules in oocytes and embryonic cells of the holothurian Apostichopus japonicus].
abstract: The yolk germinal granules in oocytes and embryonic cells of Apostichopus japonicus were studied by transmission electron microscopy. Analysis of the features of synthesis and utilization of yolk granules made it possible to reveal ultrastructural criteria to distinguish between granules of the forming and utilized yolk, and germinal granules. Based on these findings, the authors suppose that identification of germ plasm elements in oocytes and embryonic cells of A. japonicus is quite possible with ultrastructural analysis only, and does not require utilizing molecular markers.
authors.forename: A A
authors.initials: AA
authors.lastname: Reunov
authors.forename: Ia N
authors.initials: IaN
authors.lastname: Aleksandrova
mesh_terms: D000818:Animals; D036703:Blastula / Q000648:ultrastructure*; D003594:Cytoplasmic Granules / Q000378:metabolism / Q000648:ultrastructure*; D004625:Embryo, Nonmammalian / Q000648:ultrastructure; D005260:Female; D009865:Oocytes / Q000648:ultrastructure*; D047528:Stichopus / Q000196:embryology / Q000648:ultrastructure*