title: Spin label orientation at the active site of  -chymotrypsin in single crystals.
mesh_terms: D000215:Acylation; D001665:Binding Sites; D002918:Chymotrypsin; D003460:Crystallization; D003497:Cyclic N-Oxides; D004578:Electron Spin Resonance Spectroscopy; D004952:Esters; D009596:Nitrophenols; D011759:Pyrrolidines; D014961:X-Ray Diffraction
chemical_list: D003497:Cyclic N-Oxides; D004952:Esters; D009596:Nitrophenols; D011759:Pyrrolidines; D002918:Chymotrypsin