Western blotting of protein lysates from the conducting BZ myocardium revealed increased expression of NaV1.5 and Cx43 in the MI + IR hearts compared to MI controls (Fig. 4c, d), while these effects were not observed in regions of electrically inert scar tissue in the same hearts (Fig. 4e, f). Here, GJA1 is linked to myocardial infarction.