GJA1 and infarction: Interestingly, the highest percentage of short-term stem cell colonisation was observed in the case of huSkM overexpressing Cx43 combined with mesenchymal cells in post-infarction heart (Figure 5b, Supplementary Table S1), suggesting that connexin 43 expression and coadministration of MSCs that secreted paracrine factors may enhance skeletal myoblast retention in the target site.