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Alignment of putative amino acid sequences of the NtcA proteins from Synechococcus sp. strain WH 7803, Synechococcus sp. strain PCC 7942, Synechocystis sp. strain PCC 6803, Anabaena sp. strain PCC 7120, and Cyanothece sp. strain BH68K (ATCC 51142). Asterisks mark the residues identical in all five proteins. Residues unique to one protein are in bold typeface. The putative helix-turn-helix motif is underlined.
