Figure 3From: Global transcriptional analysis of nitrogen fixation and ammonium repression in root-associated Pseudomonas stutzeri A1501Unrooted neighbor-joining phylogenetic tree of the A1501 PnfA and related proteins from other bacteria. Bootstrap values based on 1,000 replications are listed as percentages at branching points. Bar, 0.1 substitutions per position. The sequence abbreviations are given in parentheses.Back to article page