GTPBP1 and hemochromatosis type 1: The region of hTfR1 that mediates binding to the ectodomain of GP1 is the apical domain, which is not involved in binding to the known principal ligands, transferrin and hemochromatosis protein (Cheng et al., 2004; Lawrence et al., 1999; Montemiglio et al., 2019), thus representing a potential host-directed therapeutic target to broadly inhibit infection by JUNV and other New World hemorrhagic fever mammarenaviruses.