100 ng CPTAC-14d (2000 ng/mL, 50 μL per well) was coated onto 96-wells. Serial dilutions (0, 0.01, 0.02, 0.05, 0.15, 0.44, 1.33, 4.00 μg/mL) of ab241329 (50 μL) were incubated with CPTAC-14d in each well for 60 minutes by shaking. This was followed by adding goat anti-rabbit IgG, (H+L), phosphatase-conjugated secondary antibody (50 μL) into each well and incubating for another 40 minutes. After washing, 50 μL of PNPP was added and incubated for 15 minutes without shaking for color development. OD was read at 405 nm within 5 minutes.