CXCL12 and ST Elevation Myocardial Infarction: It has been shown that multiple pro-homing factors including SDF-1, VEGF-A, and FGF-2 are significantly increased in their plasma level a week after the occurrence of MI in ST elevation myocardial infarction (STEMI) patients, which suggests that the optimal time of homing for stem cell transplantation [89].