we demonstrate that this allosterically modulated regulatory protein is sensitive to hgcl2 concentrations of 1.0 +/- 0.3 x 10 ( -8 ) m in the presence of 1.0 x 10 ( -3 ) m dithiothreitol for half-maximal induction of transcription of the mer promoter by escherichia coli rna polymerase in vitro .
C0040649
transcription
C0035681
rna