# OC Root 2nd 3rd 4th PC Gene/Definition OC.66167 Archaea.50271 Euryarchaeota.8017 Methanosarcina.10445 mhor.2364 mhor:MSHOH_2420 Vitamin B12 ABC transporter, ATPase component BtuD; K02013 iron complex transport system ATP-binding protein [EC:3.6.3.34]