title: Spin-labeling study on the depth of the active site of papain.
mesh_terms: D001665:Binding Sites; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004578:Electron Spin Resonance Spectroscopy; D010206:Papain; D013113:Spin Labels
chemical_list: D013113:Spin Labels; D010206:Papain