Whole cell lysates were collected from T cell samples as described previously (75 (link)). Antibodies for immunoblot analysis were Irp2 (IREB2; Thermo Fisher Scientific, PA5-19158), HFE (Invitrogen, PA5-37364), and β-actin (Cell Signaling Technology, 3700S). Blots were incubated with IRDye anti-rabbit or anti-mouse secondary antibodies (LI-COR) and imaged using the Odyssey CLx instrument. Band intensity quantification was conducted with Studio Lite software (LI-COR), and total protein signals were normalized to the β-actin signal for each sample.