FIG 2.

Bootstrapped neighbor-joining phylogeny of putative Nod and selected qNor and cNorB sequences. Nod clones generated in this study are shown in green, and available reference sequences are in red. The 6 subclusters of Nod identified in this study are indicated. The accession numbers of reference sequences used and of selected nod sequences generated in this study are shown in parentheses. Bootstrap support (1,000 replicates) greater than 50% is indicated at the nodes. The scale bar represents 20% amino acid sequence divergence.