As shown in Fig. 3A–D, between the different mice (WT and GTKO mice) and between the different groups (CON and DCM groups), there were no significant differences in the ratios of CD3+, CD3+CD4+, CD3+CD8+ T-lymphocytes and activated T-lymphocytes marked by CD3+CD69+. This evidence concerns the gene CD8A and familial dilated cardiomyopathy.