Purity ~90% (SDS-PAGE). Released during platelet aggregation. Neutralizes the anticoagulant effect of heparin because it binds more strongly to heparin than to the chondroitin-4-sulfate chains of the carrier molecule. Chemotactic for neutrophils and monocytes. Inhibits endothelial cell proliferation (By similarity). Source: Recombinant protein corresponding to aa30-105 from mouse Pf4, fused to His-SUMO-Tag at N-terminal expressed in E. coli. Molecular Weight: ~24.2kD AA