title: Direct identification of the amino acid changes in two mutant lac repressors.
mesh_terms: D000595:Amino Acid Sequence; D004926:Escherichia coli / Q000235:genetics; D009154:Mutation; D012097:Repressor Proteins / Q000235:genetics*; D014157:Transcription Factors / Q000235:genetics*
chemical_list: D012097:Repressor Proteins; D014157:Transcription Factors