# OC Root 2nd 3rd 4th PC Gene/Definition OC.456146 Bacteria.398238 Aquificae.485 Hydrogenobacter.138 hth.1140 hth:HTH_1155 hycC; Ni-Fe hydrogenase small subunit/NADH ubiquinone oxidoreductase 20 kD subunit OC.456146 Bacteria.398238 Aquificae.485 Hydrogenobacter.138 hte.1122 hte:Hydth_1147 NADH ubiquinone oxidoreductase 20 kDa subunit OC.456146 Bacteria.398238 Aquificae.485 Thermocrinis.1507 tal.1404 tal:Thal_1425 NADH ubiquinone oxidoreductase 20 kDa subunit