title: Studies on mutant phenylalanyl RNA synthetases of Escherichia coli.
mesh_terms: D002247:Carbon Isotopes; D002474:Cell-Free System; D002499:Centrifugation, Density Gradient; D002850:Chromatography, Gel; D004269:DNA, Bacterial; D004355:Drug Stability; D004926:Escherichia coli / Q000201:enzymology*; D006863:Hydrogen-Ion Concentration; D007118:Immunoassay; D007700:Kinetics; D008025:Ligases; D008970:Molecular Weight; D009154:Mutation; D010641:Phenotype; D013696:Temperature
chemical_list: D002247:Carbon Isotopes; D004269:DNA, Bacterial; D008025:Ligases