FIG 4.

Phylogenetic and environmental distribution of protein families recovered among CPR bacteria. (Upper panel) Presence/absence profiles for protein families with 5 or more members, with shaded cells indicating presence and light cells indicating absence. Columns represent protein families, hierarchically clustered by similarity in distribution across the genome set. Rows correspond to genomes, ordered by their phylogenetic position in the species tree (left). Abbreviations: Abs., Absconditabacteria; Gra., Gracilibacteria; Sac., Saccharibacteria. (Lower panels) Percentage of genomes encoding individual protein families that belonged to broad habitat groups (top) or taxonomic groups (bottom). Modules of protein families indicated in the text are represented by dashed lines (M1 to -6 and “core”).