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E. coli strains carrying the pET21a empty vector or various pET21a-sufE plasmids were grown as described in the Methods section. Serial dilutions of liquid cultures were spotted on Lennox broth (LB) plates with or without 250 μM 2,2’-bipyridyl (BiPy). Growth on plates was monitored for 24 – 48 hours at 30°C. The image shown is after 40 hours growth on BiPy plates.
