Figure 13.

A graph representing the regulation of methanogenesis genes. Red arrows indicate downregulation, blue arrows indicate upregulation, and green arrows indicate weak regulation. The thickness of the arrow shows the strength of the interaction. Turquoise nodes are known regulators. Red nodes are CO₂ efflux proteins. Olive green nodes are growth substrates. Green nodes are methyl-sulfide methyltransferase proteins. Purple nodes are methanol methyltransferase proteins. Blue nodes are acetate utilization proteins and gold nodes are methylamine methyltransferase proteins.