title: Changes in size and secondary structure of the ribosomal transcription unit during vertebrate evolution.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D002415:Cats; D002460:Cell Line; D002645:Chickens; D010856:Columbidae; D003530:Cyprinidae; D000882:Haplorhini; D008116:Lizards; D008854:Microscopy, Electron; D008961:Models, Structural; D008970:Molecular Weight; D009690:Nucleic Acid Conformation; D012335:RNA, Ribosomal / Q000032:analysis; D051381:Rats; D012260:Ribonucleases; D012265:Ribonucleotides / Q000032:analysis; D014714:Vertebrates; D014981:Xenopus
chemical_list: D012335:RNA, Ribosomal; D012265:Ribonucleotides; D012260:Ribonucleases