Predicted to enable ammonium transmembrane transporter activity. Acts upstream of or within ammonium transmembrane transport; erythrocyte development; and multicellular organismal iron ion homeostasis. Located in membrane. Is expressed in several structures, including liver; lung; metanephros; secondary oocyte; and spleen. Human ortholog(s) of this gene implicated in Rh isoimmunization. Orthologous to several human genes including RHD (Rh blood group D antigen). [provided by Alliance of Genome Resources, Apr 2022]