Predicted to enable transmembrane ascorbate ferrireductase activity. Predicted to be involved in cellular iron ion homeostasis. Predicted to be located in late endosome membrane; lysosome; and nucleolus. Predicted to be active in lysosomal membrane. Orthologous to human CYB561A3 (cytochrome b561 family member A3). [provided by Alliance of Genome Resources, Apr 2022]