title: [Improved method of E. coli RNA polymerase purification].
mesh_terms: D002499:Centrifugation, Density Gradient; D002845:Chromatography; D002848:Chromatography, DEAE-Cellulose; D012321:DNA-Directed RNA Polymerases / Q000302:isolation & purification*; D004586:Electrophoresis; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000201:enzymology*; D008722:Methods; D011479:Protamines
chemical_list: D011479:Protamines; D012321:DNA-Directed RNA Polymerases