title: Leters to the editors: Structure of the lac repressor studied by negative staining.
mesh_terms: D001426:Bacterial Proteins / Q000032:analysis; D004269:DNA, Bacterial / Q000032:analysis; D004926:Escherichia coli / Q000648:ultrastructure*; D005796:Genes; D007785:Lactose / Q000378:metabolism*; D008854:Microscopy, Electron; D008970:Molecular Weight; D009154:Mutation; D009690:Nucleic Acid Conformation; D011487:Protein Conformation
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D007785:Lactose