. "Reviewed: D'Eustachio, P, Matthews, L, Gillespie, ME, 2008-12-02 16:25:31"^^ . "Edited: May, B, Gopinathrao, G, 2008-11-19 20:02:07"^^ . "IGFBP 5 binds IGF I or IGF II via the conserved N terminus and C terminus of IGFBP 5. IGFBP 5 also binds ALS via the central portion of IGFBP 5. About 55% of IGF:IGFBP 5 complexes contain ALS. IGFBP 5 is enriched in bone matrix and acts to stimulate IGF function. IGFBP 5 is cleaved by Pregnancy associated Plasma Protein A2 (PAPP A2), ADAM 9, complement C1s from smooth muscle, and thrombin. Only the cleavage site for PAPP A2 is known. About 55% of IGF:IGFBP 5 complexes contain ALS; 45% contain only IGF and IGFBP 5."^^ . . . . . . . . . . . . . . . . . . . "Formation of the IGF:IGFBP-5:ALS Complex"^^ . . . . .