Serpin B2 inhibits urokinase-type plasminogen activator and contributes to fibrinolytic regulation. Monocyte-derived plasminogen activator inhibitor 2 (PAI-2) differs from endothelial cell-derived PAI-1, highlighting different cellular origins. Serpin B2 Protein, Human is the recombinant human-derived Serpin B2 protein, expressed by E. coli , with tag free. The total length of Serpin B2 Protein, Human is 415 a.a., with molecular weight of ~46.6 kDa.