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bssA mRNA lifetime following removal of toluene by sparging with helium gas. (a) Concentrations of nitrate and toluene over time, relative to their initial concentrations; (b) abundance of bssA gene and transcript copies/ml; and (c) bssA gene transcript/gene copy ratios. Initial toluene and nitrate concentrations were 11.2 and 15.5 mg/liter, respectively.
