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Transcriptional analysis of argC promoter activity. Expression of the indicated argC promoter-gus (β-glucuronidase) gene fusions is depicted as follows: first group, in the genetic background of the indicated species; second group, in S. meliloti; and third group, in M. loti. Bars: black, S. meliloti; gray, A. tumefaciens; empty, R. etli; patterned, M. loti.
