# OC Root 2nd 3rd 4th PC Gene/Definition OC.509056 Bacteria.260559 Proteobacteria.150277 Alphaproteobacteria.316876 magq.329 magq:MGMAQ_0257 hybD; maturation element for NiFe hydrogenase 2; K03605 hydrogenase maturation protease [EC:3.4.23.-]