ATFRO4/FRO4 (FERRIC REDUCTION OXIDASE 4); ferric-chelate reductase. similar to FRO1 (FERRIC REDUCTION OXIDASE 1), ferric-chelate reductase [Arabidopsis thaliana] (TAIR:AT1G01590.1); similar to ATFRO5/FRO5 (FERRIC REDUCTION OXIDASE 5), ferric-chelate reductase [Arabidopsis thaliana] (TAIR:AT5G23990.1); similar to FRO2 (FERRIC REDUCTION OXIDASE 2), ferric-chelate reductase [Arabidopsis thaliana] (TAIR:AT1G01580.1); similar to Fe(III)-chelate reductase [Citrus junos] (GB:ABJ16556.1); similar to unnamed protein product [Vitis vinifera] (GB:CAO49469.1); similar to hypothetical protein [Vitis vinifera] (GB:CAN74772.1); contains InterPro domain Cyto