title: Removal of chymotrypsin activity from crystalline trypsin and its investigation.
mesh_terms: D002845:Chromatography; D002850:Chromatography, Gel; D002918:Chymotrypsin; D007659:Ketones; D008722:Methods; D014357:Trypsin / Q000302:isolation & purification*
chemical_list: D007659:Ketones; D002918:Chymotrypsin; D014357:Trypsin