title: Three-dimensional reconstruction and averaging of 50 S ribosomal subunits of Escherichia coli from electron micrographs.
mesh_terms: D004926:Escherichia coli / Q000648:ultrastructure*; D008854:Microscopy, Electron; D008961:Models, Structural; D010316:Particle Size; D012270:Ribosomes / Q000648:ultrastructure*