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Diagram of the putative promoter region upstream of nifH and putative terminator region downstream of nifN in the M. mazei nif gene cluster. Abbreviations and symbols: * = transcriptional start site; TATA-box = archaeal TATA-box promoter element; BRE = factor B recognition element; stem loop structures are marked by arrows indicating the length and orientation of the stems. Sequences are numbered relative to the mRNA initiation site determined by the 5′ RACE method.
