title: Small-angle X-ray study of DNA-dependent RNA polymerase subunit sigma from Escherichia coli.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D012321:DNA-Directed RNA Polymerases; D004926:Escherichia coli / Q000201:enzymology*; D008433:Mathematics; D012542:Scattering, Radiation; D012808:Sigma Factor; D014157:Transcription Factors; D014965:X-Rays
chemical_list: D012808:Sigma Factor; D014157:Transcription Factors; D012321:DNA-Directed RNA Polymerases