|  |  | transporter activityendosomeearly endosomecytosolplasma membranetransportion transportGolgi to plasma membrane transportendocytosiscupric reductase activityresponse to hormonecopper ion importmembraneintegral component of membraneoxidoreductase activitytrans-Golgi network transport vesicleintegral component of Golgi membraneregulated secretory pathwaymetal ion bindingferric-chelate reductase (NADPH) activityiron ion homeostasisoxidation-reduction processferric iron import into cell
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