isolation and purification of the collagen from the descemet 's membrane/posterior collagenous layer ( dm/pcl ) showed an increased amount of material with molecular weight in the range of 50-60k daltons ( presumably type viii collagen ) and decreased amounts of higher molecular weight , disulfide-bonded collagenous materials ( presumably type iv collagen ) as compared with normals .
C0009325
collagen
C0009333
type iv collagen