title: Structural dynamics of bacterial ribosomes. IV. Classification of ribosomes by subunit interaction.
mesh_terms: D001665:Binding Sites; D002458:Cell Fractionation; D002499:Centrifugation, Density Gradient; D004926:Escherichia coli / Q000378:metabolism / Q000648:ultrastructure*; D008274:Magnesium / Q000494:pharmacology; D012260:Ribonucleases; D012270:Ribosomes / Q000187:drug effects / Q000378:metabolism / Q000648:ultrastructure*
chemical_list: D012260:Ribonucleases; D008274:Magnesium