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Immunohistochemical staining for VEGF showed significantly increased expression of VEGF in the SDF-1α treated group (B, D-G) especially in the superficial zone of the cartilage (H), while AMD3100 impaired the SDF-1α-induced expression of VEGF (C, D-G) (10×10). P values indicate the statistical differences between groups. (IOD: integrated optical density)
