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β-Galactosidase assays of M. smegmatis mc2155 wild-type and mcJA8 and mcJF3 mutant strains, assayed at physiological (1.4 nM) and inducing (100 μM) zinc concentrations. (A) pSM derivatives pBT5 and pBT9 containing the promoter fragments of the Rv2358-furB operon. (B) β-Galactosidase activity results.
