In the new study, however, researchers were able to take cells from men's testicular tissue, isolate stem cells, and turn them into insulin-secreting islet cells.

But after the cells have established themselves and begun secreting their own extracellular matrix, the scaffold should dissolve, leaving behind only healthy tissue.

The recruited cells contribute to myocardial regeneration both as a structural component of the regenerating tissue and by secreting angiogenic or antiapoptotic factors, including cytokines.