PSMB8 and myocarditis: Next, CD8 T cells were isolated from CVB3-infected β5i/LMP7+/+ and β5i/LMP7-/- mice (both CD45.2) at d8 p.i. These cells were transferred into naive β5i/LMP7+/+ and β5i/LMP7-/- mice, which were then infected with CVB3 and sacrificed at d8 p.i. to assess myocarditis scores.