Part A: Sample preparation and data collection. 3d reconstruction from electron micrographs a personal account of its development -- Preparation of 2d crystals of membrane proteins for high-resolution electron crystallography data collection -- Helical crystallization of soluble and membrane binding proteins -- Plunge freezing for electron cryomicroscopy -- A practical guide to the use of monolayer purification and affinity grids -- Grafix: Stabilization of fragile macromolecular complexes for single particle cryo-EM -- Cryonegative staining of macromolecular assemblies -- Liposomes on a streptavidin crystal: A system to study membrane proteins by cryo-EM -- Micromanipulator-assisted vitreous cryosectioning and sample preparation by high-pressure freezing -- Site-specific biomolecule labeling with gold clusters -- How to operate a cryo-electron microscope -- Collecting electron crystallographic data of two-dimensional protein crystals -- Automated data collection for electron microscopic tomography -- Correlated light and electron cryo-microscopy -- Phase plates for transmission electron microscopy -- Radiation damage in electron cryomicroscopy.