biochemical , electron microscopic and immunocytochemical analyses of these cultures indicate that schwann cells in contact with axons are able to generate a basal lamina ( containing type iv collagen , laminin and heparan sulphate proteoglycan ) and fibrous collagen , without the aid of other cells , and that axonal contact is required for deposition of the basal lamina .
C0009333
type iv collagen
C0009325
collagen