Cell adhesion glycoprotein which is widely distributed in basement membranes. Binds to collagens I and IV, to perlecan and to laminin 1. Does not bind fibulins. It probably has a role in cell-extracellular matrix interactions. Interacts with LAMA2 (By similarity). Interacts with COL13A1. Interacts with EFEMP2 (By similarity). Heart, placenta and bone. Less in pancreas, kidney and skeletal muscle. Highly N- and O-glycosylated.