title: Simultaneous determination of tyrosine and tryptophan residues in proteins by second-derivative spectroscopy.
mesh_terms: D006863:Hydrogen-Ion Concentration; D011506:Proteins / Q000032:analysis*; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D014364:Tryptophan / Q000032:analysis*; D014443:Tyrosine / Q000032:analysis*
chemical_list: D011506:Proteins; D014443:Tyrosine; D014364:Tryptophan