ferroxidase activity https://github.com/geneontology/go-ontology/issues/20675 https://github.com/geneontology/go-ontology/issues/30193 molecular_function ferroxidase I Fe(II):oxygen oxidoreductase activity Reactome:R-HSA-917933 Catalysis of the reaction: 4 Fe2+ + 4 H+ + O2 = 4 Fe3+ + 2 H2O. caeruloplasmin ferroxidase, iron II:oxygen oxidoreductase activity MetaCyc:RXN0-1483 RHEA:11148 GO:0004322 Reactome:R-HSA-1562626 Reactome:R-HSA-1562604 Reactome:R-HSA-1562603 EC:1.16.3.1 ferro:O2 oxidoreductase activity hephaestin Reactome:R-HSA-5691107 multicopper ferroxidase iron transport mediator activity ceruloplasmin Reactome:R-HSA-5621402 HEPH iron(II): oxygen oxidoreductase activity Reactome:R-HSA-917891 oxidoreductase activity, acting on metal ions, oxygen as acceptor