TFRC and infection: On day 15 of infection, Ag-expCD4+ T cells expressed lower levels of Glut-1 (a glucose transporter), CD98 (a component of the Slc7a5 heterodimeric large neutral amino acid transporter), and CD71 (a transferrin receptor) than Ag-expCD4+ T cells from day 5 of infection (Fig. 3A, 3B).