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Mobility shift experiments for the Thermus argF promoter region with E. coli ArgR and B. stearothermophilus AhrC in the absence (A) and presence (B) of arginine. Lanes l, no added protein; lanes 2, argF promoter fragment incubated with B. stearothermophilus AhrC; lanes 3, argF promoter fragment incubated with E. coli ArgR.
