Tryptophan residue in the active site of papain.
D001665:Binding Sites; D006863:Hydrogen-Ion Concentration; D010206:Papain; D013053:Spectrophotometry; D013447:Sulfites; D014364:Tryptophan; D014466:Ultraviolet Rays
D013447:Sulfites; D014364:Tryptophan; D010206:Papain