Secreted frizzled related protein 2 (Sfrp2) is the key Akt-mesenchymal stem cell-released paracrine factor mediating myocardial survival and repair. - Mirotsou,M.; Zhang,Z.; Deb,A.; Zhang,L.; Gnecchi,M.; Noiseux,N. (Proc Natl Acad Sci USA, 2007)