Table 2. Nitrogen fixation regulatory sites in archaea.

Italic bold, sites identified by the signal determination procedure and used to construct the initial profile; bold, sites used to construct the final profile; capitals, nucleotides conforming to the consensus; numbers in parentheses in the ‘pos.’ column give the length of the upstream region if no site was found (position of the first coding nucleotide is given); C.G. in column AC stands for complete genome.