title: Diffraction methods for biologic macromolecules. Phase refinement/extension by density modification.
mesh_terms: D008836:Micrococcal Nuclease; D011487:Protein Conformation; D011506:Proteins; D014961:X-Ray Diffraction / Q000379:methods
chemical_list: D011506:Proteins; D008836:Micrococcal Nuclease