title: Ultrastructural study of nucleolar organizers in the quail oocyte during meiotic prophase I.
mesh_terms: D000818:Animals; D002466:Cell Nucleolus / Q000648:ultrastructure*; D002875:Chromosomes / Q000648:ultrastructure; D005260:Female; D006570:Heterochromatin / Q000648:ultrastructure; D008540:Meiosis; D009865:Oocytes / Q000648:ultrastructure*; D009940:Organoids / Q000648:ultrastructure; D010063:Ovum / Q000648:ultrastructure*; D011784:Quail / Q000033:anatomy & histology*
chemical_list: D006570:Heterochromatin