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zmaR-containing cell extracts inactivate zwittermicin A. A zone of inhibition indicates activity of zwittermicin A against E. coli; the assay was initiated with 50 μg of zwittermicin A. Zones: 1, zwittermicin A alone; 2, zwittermicin A incubated with vector-containing (pGEM) cell extract; 3, zwittermicin A incubated with zmaR-containing (pZMG4) cell extract.
