title: Preface.
authors: MRC Laboratory of Molecular Biology, Cambridge, United Kingdom.
authors: R A
authors: RA
authors: Crowther
mesh_terms: D018360:Crystallography, X-Ray; D004798:Enzymes / Q000648:ultrastructure*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008854:Microscopy, Electron / Q000295:instrumentation / Q000379:methods*; D019906:Nuclear Magnetic Resonance, Biomolecular; D012984:Software
chemical_list: D004798:Enzymes