The nucleolus and the nucleolar organizer regions.
D000818:Animals; D002453:Cell Cycle; D002460:Cell Line; D002466:Cell Nucleolus / Q000502:physiology* / Q000648:ultrastructure; D002843:Chromatin / Q000648:ultrastructure; D002940:Circadian Rhythm; D004275:DNA, Ribosomal / Q000378:metabolism; D004622:Embryo, Mammalian / Q000502:physiology; D005718:Gametogenesis; D006651:Histocytochemistry; D006801:Humans; D007158:Immunologic Techniques; D008854:Microscopy, Electron; D008970:Molecular Weight; D009697:Nucleolus Organizer Region / Q000502:physiology* / Q000648:ultrastructure; D009698:Nucleoproteins / Q000378:metabolism; D018521:Plant Physiological Phenomena; D010944:Plants / Q000648:ultrastructure; D012335:RNA, Ribosomal / Q000378:metabolism; D012639:Seeds / Q000502:physiology; D014158:Transcription, Genetic; D014617:Vacuoles / Q000502:physiology / Q000648:ultrastructure
D002843:Chromatin; D004275:DNA, Ribosomal; D009698:Nucleoproteins; D012335:RNA, Ribosomal