title: Morphology of transcriptional units of rDNA. Evidence for transcription in apparent spacer intercepts and cleavages in the elongating nascent RNA.
mesh_terms: D000076:Acetabularia; D000663:Amphibians; D000818:Animals; D002466:Cell Nucleolus / Q000648:ultrastructure; D002843:Chromatin / Q000648:ultrastructure*; D004247:DNA; D005260:Female; D007313:Insecta; D009690:Nucleic Acid Conformation; D009865:Oocytes / Q000648:ultrastructure; D012335:RNA, Ribosomal / Q000096:biosynthesis*; D012261:Ribonucleoproteins; D013045:Species Specificity; D014158:Transcription, Genetic
chemical_list: D002843:Chromatin; D012335:RNA, Ribosomal; D012261:Ribonucleoproteins; D004247:DNA