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Relative MCP-1 and SDF-1 mRNA expression. The chemokine expression of MCP-1 and SDF-1, normalized to β-actin was measured at weeks 1, 2 and 3 following the final injection of methylprednisolone to develop the rabbit model of avascular necrosis of femoral head. **P<0.05 vs. the normal group. MCP-1, monocyte chemoattractant protein-1; SDF-1, stromal cell-derived factor-1.
