title: [Purification of RNA polymerase in Escherichia coli].
mesh_terms: D002482:Cellulose; D002499:Centrifugation, Density Gradient; D002845:Chromatography; D004926:Escherichia coli / Q000201:enzymology*; D008722:Methods; D008854:Microscopy, Electron; D012316:RNA Nucleotidyltransferases / Q000302:isolation & purification*
chemical_list: D002482:Cellulose; D012316:RNA Nucleotidyltransferases