Moreover, compared to non-DCM hearts, DCM hearts showed a higher proportion of CD8(+) T cells, T follicular helper cells, and M2 macrophages, as well as a lower proportion of memory B cells, CD4(+) memory resting T cells, activated mast cells and eosinophils (Fig. 4C). The gene discussed is CD8A; the disease is familial dilated cardiomyopathy.