At three days post-MI both Wt1 and Cre mRNA expression were detected in the epicardium overlaying the border zone of the infarct (Figure 2G–I) as well as the infarction itself, albeit at lower levels (Figure 2J, L and N), and was absent from epicardium located remotely of the infarct (Figure 2K, M, and O). Here, WT1 is linked to infarction.