title: 13C-NMR studies of selectively carboxymethylated [methyl-13C]methionine-labeled bacterial dihydrofolate reductase.
mesh_terms: D002247:Carbon Isotopes; D007553:Isotope Labeling / Q000379:methods; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008715:Methionine; D013291:Streptococcus / Q000201:enzymology*; D013762:Tetrahydrofolate Dehydrogenase / Q000378:metabolism*
chemical_list: D002247:Carbon Isotopes; D008715:Methionine; D013762:Tetrahydrofolate Dehydrogenase