DDAb1, DDAb2, and DDAb8 recognize constructs 1 to 3 captured in a microtiter plate by monoclonal AP5. Bound antibody was detected by ELISA. Dark bars indicate reactions in the presence of 0.4 mM quinine; lighter bars show reactions in the absence of drug. Reactions were performed in triplicate. Error bars represent 1.0 SD. “Plt Lys” indicates reactions with GPIIIa captured from platelet lysate.