Effect of 6-AHA on the inhibition of scuPA/suPAR by plasminogen. The plasminogen activator activity of scuPA/suPAR complex (5 nM; Comp.) was determined as in Figures 5 and 6 using a fixed concentration of plasminogen (1 μM) and in absence (Comp.) or presence of 0.1 mM 6-AHA (Comp. + 6AHA).