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. 2019 Feb 20;10:278. doi: 10.3389/fmicb.2019.00278

FIGURE 2.

FIGURE 2

Determination of different heavy-metal resistance mechanisms in the mutant strains. (A) Resistance of mutant strains to Cd2+. (B) Resistance of mutant strains to Cu2+ (CuCl2). (C) Resistance of mutant strains to Zn2+ (ZnSO4). (D) Resistance of mutant strains to Ni2+ (NiSO4).