to the Murine Myocardium. TissueMend (TEI Biosciences) was prepared and cells were seeded as previously described [48] . Briefly, TissueMend matrices (2 mm × 2 mm × 0.8 mm) were placed in wells of 24-well plates containing α-MEM-complete culture medium. Following electroporation, vMSCs were seeded on the TissueMend sections at a concentration 3 times greater than MSCs (cell control due to 30% cell viability after electroporation, yielding 1 × 10 6 cells/mL. Medium was changed at 24 and 48 h, at which point the TissueMend matrix containing ∼2.3 × 10 4 MSCs, vMSCs, or unseeded (matrix control) was tacked to the myocardium at each corner of the matrix. The matrix was placed such that it was in contact with both the infarct and the peri-infarct regions of the myocardium [48] .