FIG. 4.

Effect of merG on bacterial uptake of ²⁰³Hg²⁺ (A and C) and ¹⁴C₆H₅Hg⁺ (B and D). E. coli XL1-Blue cells with pMRA17 (■), pMU29 (○), pMU29 and pMEV89 (•), pMRD141 (◊), pMRD141 and pMEV89 (⧫) and pBluescriptII SK+ (▵) were grown, induced, and harvested as described in Materials and Methods. After addition of the radioactive mercurials, aliquots were removed periodically, filtered, and washed. All values are the means of triplicate determinations from three experiments.