Figure 4 Metabolic pathways that are present in genomes of the Clade C and Clade E, but incomplete among genomes of Apibactergroup. A. Histidine degradation pathway; B. Fatty acid beta-oxidation pathway; C. Phenylacetate oxidation pathway. Black arrow, genes mostly present in genomes from three groups; Red arrow, genes are absent among all genomes in Apibacter group, but possessed by genomes in Clade C and E (genes distributions are provided in Dataset S5). Substrates in red in phenylacetate degradation are documented to be toxic to host.