1. From the Division of Cardiovascular Medicine, Department of Medicine, Stanford University Medical Center, CA (P.J.K., M.M., X.G., Y.M., I.T., S.M., N.G.K., M.V.M., E.R., P.C.Y.); Baxter Laboratory for Stem Cell Biology, Department of Microbiology and Immunology, Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, CA (J.R., C.H., H.B.); and Eagle Vision Pharmaceutical Corporation, Exton, PA (P.H.).