title: Immature 50 S subunits in Escherichia coli polyribosomes.
mesh_terms: D004926:Escherichia coli / Q000648:ultrastructure; D009024:Morphogenesis; D009694:Nucleic Acid Precursors / Q000378:metabolism; D011132:Polyribosomes / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D012335:RNA, Ribosomal / Q000378:metabolism; D012260:Ribonucleases / Q000378:metabolism; D012270:Ribosomes / Q000378:metabolism* / Q000648:ultrastructure
chemical_list: D009694:Nucleic Acid Precursors; D012333:RNA, Messenger; D012335:RNA, Ribosomal; D012260:Ribonucleases