Figure 3.

Phylogenetic diversity of the AAC(6′)-Ib variants and their relative abundance in various ecological niches. Bayesian maximum clade credibility phylogeny and abundance profiles of 460 unique protein sequences of AAC(6′)-Ib were presented for 41 environmental samples. Each phylogenetic lineage is assigned to one of seven major types of AAC(6′)-Ib and is colored differently. Others (black) indicate sequences that were not assigned to the seven major types. Representative variant sequences of each type (Table 1) are indicated with arrows.