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Measurement of interleukin (IL)‐6 levels in the supernatants of cultured rheumatoid arthritis synovial fibroblast‐like cells (RASFs) using enzyme‐linked immunosorbent assay (ELISA). RASFs (n = 10) were cultured and transfected with siRNAs for 72 h. The figure shows the standard deviation (s.d.) to indicate the variability of the data.
