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Levels of VEGF secretion from peripheral blood mononuclear cells (PBMC) isolated from 10 rheumatoid arthritis (RA) patients in response to transforming growth factor-beta 1 (TGF-β1) (a) and TNF-α (b) at 100, 10, 1, 0.1 and 0.01 ng/ml after 24 h in culture. *P < 0.05 compared with control (one-way anova with Bonferroni correction).
