Figure 1.
Unrooted phylogenetic tree reconstructed from a toy example multiple alignment. The multiple alignment shown was constructed from taxaknown members of a given Pfam family (PF1,…,PF7) and EGTs matching that family (EGT1,EGT2,EGT3). A phylogenetic tree reconstructed from the alignment is illustrated on the right. The environmental gene tag EGT1 is localized in a subtree c*(EGT1) of cyanobacteria (depicted in blue). Hence, it is classified as ‘Bacteria Cyanobacteria’. As c*(EGT1) contains cyanobacteria from different genera, EGT1 is classified as an unknown taxon at the rank of genus.