Standard curve of mouse IL-6 matched pair antibodies: Sandwich ELISA analysis of mouse IL-6 matched pair antibodies Elisa assay was performed by coating wells of a 96-well plate with 50 µl per well of capture antibody PSH0-58 diluted in carbonate/bicarbonate buffer, at a concentration of 2 µg/mL overnight at 4℃. Wells of the plate were washed, blocked with 150 µl 0.05% tween-20 1%BSA blocking buffer, and incubated with serial diluted IL-6 protein starting from 2000 pg/ml to 0 pg/ml and detect antibody PSH0-59-Biotin (0.2 µg/ml) for 1 hour at 30℃ with shaking. Then the plate was washed and incubated with 50 µl per well of Streptavidin-HRP for 0.5 hour at 30℃ with shaking. Detection was performed using an Ultra TMB Substrate for 10 minutes at room temperature in the dark. The reaction was stopped with sulfuric acid and absorbances were read on a spectrophotometer at 450 nm.