FIGURE 2.

ETP-related pathways reconstructed from the metagenome sequences of the ruminal microbiome. (A) Methane metabolism; (B) nitrogen metabolism; (C) sulfur metabolism; (D) reductive acetyl-CoA pathway (Wood-Ljungdahl pathway). The numbers in the boxes represent the EC numbers of pathway enzymes. The box in pink refers to the SLP enzymes. The box in blue refers to the electron transporter. THF is the abbreviation of tetrahydrofuran. THMPT is the abbreviation of tetrahydromethanopterin. KO numbers and gene annotation of the enzymes are shown in Supplementary Table 1.