TNNI3 and Sepsis: In addition, we performed TUNEL staining with hearts of septic WT mice and found that the percentage of TUNEL+cTnI+ cells in total cells (TUNEL+cTnI+/4,6-diamidino-2-phenylindole (DAPI)) was very low (around 1%) on day 3 after sepsis (Extended Data Fig. 6i).