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URL: http://scholar.google.com/scholar_lookup?title=The+promoter+spacer+influences+transcription+initiation+via+sigma70+region+1.1+of+Escherichia+coli+RNA+polymerase&year=2009&author=Hook-Barnard&journal=Proc+Natl+Acad+Sci+U+S+A&volume=106&issue=3&pages=737-742&doi=10.1073%2Fpnas.0808133106&pmid=19139410