Heparin-binding protein which binds to FGF2, prevents binding of FGF2 to heparin and probably inhibits immobilization of FGF2 on extracellular matrix glycosaminoglycans, allowing its release and subsequent activation of FGFR signaling which leads to increased vascular permeability. . This is the function of Ensembl gene identifier ENSG00000174721 (FGFBP3, fibroblast growth factor binding protein 3).