title: Crystals of glutamine synthetase from Escherichia coli.
mesh_terms: D000645:Ammonium Sulfate; D003460:Crystallization; D004926:Escherichia coli / Q000201:enzymology*; D005974:Glutamate-Ammonia Ligase; D008433:Mathematics; D008854:Microscopy, Electron; D008961:Models, Structural; D014961:X-Ray Diffraction
chemical_list: D005974:Glutamate-Ammonia Ligase; D000645:Ammonium Sulfate