Figure 3: The kringle domain of uPA mediates binding to 𝛼 v 𝛽 3 . The uPA kringle domain was immobilized onto wells of 96-well microtiter plates at the indicated coating concentrations and incubated with 𝛽 3 -CHO, uPAR-CHO, or mock-CHO cells. The ability of the uPA fragments to support adhesion of these cells was determined [38].