GAL and ischemia: A direct proof for the possible regeneration of post-MI myocardium by mesenchymal stem cells may require performance of stem cell lineage tracing using biologically labeled stem cells (e.g., green fluorescent protein labeled stem cells) administered into anti-Gal producing GT-KO mice that underwent ischemia/reperfusion and treated with α-gal nanoparticles following the reperfusion.