established a troponin I-directed autoimmune myocarditis mouse model to explore the role of subcellular localized immunoproteasome (including low-molecular-weight protein 2 (LMP2), low-molecular-weight protein 7 (LMP7), and multicatalytic endopeptidase complex subunit 1 (MECL1)) (21). Here, PSMB9 is linked to autoimmune myocarditis.