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CitM can fully complement a deficiency in magnesium transport activity. (A) The growth of strains containing deletions in transporter genes was measured by Klett readings for cells cultured in glucose minimal medium. (B) An inducible version of the citM gene was ectopically integrated in a single copy into a nonessential gene (amyE) for several of the mutant strains, and then growth was measured with and without induction of CitM expression.
