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Background Cellular repressor of E1A-stimulated genes (CREG) is a mannose-6-phosphate-containing secreted glycoprotein of 220 amino acids.It has been proposed that CREG acts as a ligand that enhances differentiation and/or reduces cell proliferation.In humans, the potential therapeutic role of embryonic stem cells (ESCs) in ischemic heart disease is subject to intense investigation.Particularly, the contribution of ESCs to angiogenesis and cardiomyogenesis in myocardial ischemia is not well established.In our studies, we induced myocardial infarct (MI) in mouse model, and monitored the effects of CREG modified ESCs transplantation on cardiac function.