The Editors of Medical Science Monitor wish to inform you that the above manuscript has been retracted from publication due to concerns with the credibility and originality of the study, the manuscript content, and the Figure images.Reference:Rongfeng Zhang, Jianwei Liu, Shengpeng Yu, Dong Sun, Xiaohua Wang, Jingshu Fu, Jie Shen, Zhao Xie. Osteoprotegerin (OPG) Promotes Recruitment of Endothelial Progenitor Cells (EPCs) via CXCR4 Signaling Pathway to Improve Bone Defect Repair. Med Sci Monit, 2019; 25: 5572-5579. DOI: 10.12659/MSM.916838
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