on the basis of evidence that the filaments are type iv collagen molecules and the double tracks are polymerized heparan sulfate proteoglycan , it is proposed that cords are composed of an axial filament of type iv collagen to which are associated glycoprotein components ( laminin , entactin , fibronectin ) and the double tracks of the proteoglycan .
C0017968
glycoprotein
C0022984
laminin