title: An electron microscopic study of large bacterial polyribosomes.
mesh_terms: D002499:Centrifugation, Density Gradient; D004926:Escherichia coli / Q000166:cytology*; D005696:Galactosidases / Q000378:metabolism; D008854:Microscopy, Electron; D012270:Ribosomes
chemical_list: D005696:Galactosidases