# OC Root 2nd 3rd PC Gene/Definition OC.20900 Archaea.1513 Euryarchaeota.38363 max.306 max:MMALV_03030 CoB-CoM heterodisulfide reductase, subunit A; K03388 heterodisulfide reductase subunit A2 [EC:1.8.7.3 1.8.98.4 1.8.98.5 1.8.98.6]