Fig. 2

Abundance and taxonomic origin of hydrolytic enzymes in the biogas, elephant, and cow rumen data sets. a Dominant cellulolytic glycoside hydrolase families and b carbohydrate esterases families in metagenomic data sets. Sequences which could not be assigned to a distinct bacterial phylum using MEGAN’s LCA algorithm are shown in grey. The number of potential enzymes was normalized to 1 Gb of assembled DNA