title: An X-ray crystallographic investigation of exchange of localized sulfate ions in crystals of alpha-chymotrypsin.
mesh_terms: D002918:Chymotrypsin / Q000032:analysis*; D003460:Crystallization; D004583:Electrons; D006859:Hydrogen; D008433:Mathematics; D008968:Molecular Conformation; D012643:Selenium; D013431:Sulfates / Q000032:analysis*; D014961:X-Ray Diffraction
chemical_list: D013431:Sulfates; D006859:Hydrogen; D002918:Chymotrypsin; D012643:Selenium