Figure 6.

The anaerobic cobalamin synthesis pathway with gene distributions within the three metagenomes by taxonomic classification. The heat map depicts presence/absence of cobalamin synthesis pathways where red = genes absent; yellow = partial pathway, less than 50% of genes detected; light green = partial pathway, greater than 50% of genes detected; and dark green = complete pathway detected. Black circles indicate the specific genes detected for each microbial group. Abbreviations: DMB = 5,6-dimethylbenzimidazole, NMN = nicotinamide mononucleotide, Dhc = Dehalococcoides, Firm = Firmicutes, EurA = Euryarchaeota, δ/γ-Prot = Proteobacteria, BC = Bacteroidetes/Chlorobi group, Cflx = Chloroflexi.