Recently, Chun Yang, the postdoctoral  researcher from BEBC, published a paper “Relation between C-X-C Motif Chemokine Receptor 4 Levels and the Presence and Extent of Angiographic Coronary Collaterals in Patients with Chronic Total Coronary “on the journal The American Journal of Cardiology of publication (IF 3.154). The article reports the collateral circulation in the heart in pathological conditions associated with circulating stem cell receptor CXCR4 expression and influence factors of its expression. Collateral circulation in ischemic myocardium is of great importance to protect the residual tissue, the findings are the first to suggest different individual circulating stem cells CXCR4 expression differences may cause endogenous collateral formation. The study put forward new research direction For stem cell therapeutic angiogenesis.