title: 13C NMR evidence of the slow exchange of tryptophans in dihydrofolate reductase between stable conformations.
mesh_terms: D009682:Magnetic Resonance Spectroscopy; D011487:Protein Conformation; D013291:Streptococcus / Q000201:enzymology; D013762:Tetrahydrofolate Dehydrogenase; D014364:Tryptophan
chemical_list: D014364:Tryptophan; D013762:Tetrahydrofolate Dehydrogenase