Fig. 3
Metal selectivity of biosensors based on E. coli-arsR/zntA upon engineered ArsRs. E. coli-arsR/zntA harboring pArsAp-eGFP and engineered ArsRs including ArsR W4 (A), ArsR W6 (B), ArsR YJ6 (C), and ArsR YJ20 (D) exposed to 5 µM of metal(loid) ions for 2 h