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Correlation between levels of cell-associated vascular endothelial growth factor (VEGF) and expression of integrins CD11b (a) or CD18 (b) in freshly isolated synovial fluid (SF) neutrophils. Cell-associated VEGF and cell surface integrins were assayed by ELISA and flow cytometry, respectively. Each point represents an individual RA patient. MFI, Mean fluorescence intensity.
