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Phylogenetic tree of available NtcA proteins. The sequences used to derive the tree are shown in Fig. 1. A neighbor-joining tree derived from an alignment performed by the Clustal X (1.63b) program is presented, with bootstrap values (based on 1,000 bootstrap trials) shown at the nodes. The Synechococcus sp. strain PCC 7942 CysR protein, a homologue of NtcA, was used to root the tree. Scale bar, 0.05 amino acid substitution per position.
