pleiotrophin HBNF HBGF8 heparin binding growth factor 8 neurite growth-promoting factor 1 HARP HB-GAM HBBM HBGF-8 HBNF-1 NEGF1 OSF-1 heparin affin regulatory protein heparin-binding brain mitogen heparin-binding growth factor 8 heparin-binding growth-associated molecule heparin-binding neurite outgrowth promoting factor heparin-binding neurite outgrowth-promoting factor 1 osteoblast-specific factor 1 pleiotrophin (heparin binding growth factor 8, neurite growth-promoting factor 1) HBNF1 Pleiotrophin Heparin-binding brain mitogen Heparin-binding growth factor 8 Heparin-binding growth-associated molecule Heparin-binding neurite outgrowth-promoting factor Heparin-binding neurite outgrowth-promoting factor 1 Osteoblast-specific factor 1