Complex I - 39 kDa subunit-FAD cofactor Complex I - 23 kDa subunit-2 x 4Fe-4S cluster complex Complex I - 20 kDa subunit-4Fe-4S cluster complex Complex I - 42 kDa subunit-FAD cofactor HP subcomplex Hydrophobic Protein fraction Reactome DB_ID: 163929 Reactome Database ID Release 43163929 Reactome, http://www.reactome.org ReactomeREACT_6454 has a Stoichiometric coefficient of 1