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Resistance ofC. testosteroniS44 andiscRmutants to As(III), Cu(II) and Cd(II). All strains were inoculated into 5 ml liquid LB medium supplemented with different concentrations of (A) As(III), (B) Cu(II) and (C) Cd(II), respectively. The OD value was determined after 24 h incubation. Different letters above bars at each metal concentration indicate significant differences between wild type S44, mutants iscR-280, iscR-327 and iscR-513 (P < 0.05).
