CD8A and hydrops fetalis: Increased numbers of total CD3+ T cells (Figure 6A) and CD8+ cytotoxic T cells (Figure 6B) were detected in human HF tissue with more CD3+ and CD8+ cells in 5 out of 7 (71%) ischemic HF patients compared with donors, confirming the relevance of myocardial CD8+ T cells in human HF.