Neighbor-joining phylogenetic tree of the 445 DUF71 homologs identified in public databases. The scale bar represents the average number of substitutions per site. Numbers at nodes are bootstrap values. For clarity only values greater than 50% are indicated. Colors correspond to the taxonomic affiliation of sequences (see the box on the figure for details). The full tree of Cluster 1 is shown in Additional file 3: Figure S3).