Late steps in the formation of E. coli RNA polymerase-lambda P R promoter open complexes: characterization of conformational changes by rapid [perturbant] upshift experiments
1 Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, WI 53706-1322, USA 2 Department of Biochemistry, University of Wisconsin-Madison, 433 Babcock Dr., Madison, WI 53706-1544, USA