RA-FLS were kept in serum-free medium for 24 h before small interfering RNA (siRNA) treatment with DharmaFECT siRNA transfection reagent and siRNA against GAPDH, KCNMB1, or KCNMB3 (GE Dharmacon, Lafayette, CO) as described previously [12 (link)]. Cells were used 40–80 h later.
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