Sandwich ELISA - IL-1ra (Interleukin-1ra) Mouse ELISA Kit (ab113348)IL-1Ra detected in supernatants from RAW 246.7 control cells (C) or cells stimulated for 24 hours with 50 ng x mL-1 of PMA (ab120297) (P), or 24 hours with PMA and 1 ug x mL-1 of LPS (Sigma) (P+L) for the last 6 hours. Results shown after background signal was subtracted (duplicates +/- SD).