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Putative NtcA promoters found for gene clusters involved in nitrate/nitrite uptake. A open or solid box upstream of a gene (arrowed box) represents a putative NtcA promoter identified at P-value <0.01 or 0.05, respectively. A dashed box represents a strong putative NtcA promoter, but it is not identified at these two statistical significant levels. A ‘…’ indicates that there is more than one gene in between its two flanking genes.
