A description of the method used in the EM experiment
to generate the map.
SINGLE PARTICLE: reconstruction of asymmetric particles or
particles with point symmetry, e.g., ribosome, GroEL,
FILAMENT: reconstruction of particles with helical symmetry,
e.g., filamentous phage, helical acetylcholine receptor crystal
2D CRYSTAL: reconstruction of a 2D lattice, e.g., aquoporin
crystal, bacteriorhodopsin crystal
3D CRYSTAL: reconstruction of a 3D lattice, e.g., yeast
peroxisome crystal, acrosomal bundle
INDIVIDUAL STRUCTURE (TOMOGRAM): reconstruction of a single object,
e.g., bacterial cell, desmosomal knot
MULTIPLE SELECTION: multiple methods used.