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NtcA regulation of nifH1. (A) Comparison of the putative NtcA-binding sites from glnA (55) and various nifH1 genes to the altered putative NtcA-binding site that is −40 to the nifH1 processing site in JU425. (B) Comparison of nitrogenase activity between the wild type and the putative NtcA-binding site mutant (JU425). Nitrogenase is expressed as nmol of ethylene mg OD720−1 h−1.
