finally , the use of a reconstituted basement membrane containing known amounts of laminin , type iv collagen , and heparan sulfate proteoglycan as a standard , led to the conclusion that , in the tumor matrix , the relative content of laminin to type iv collagen to the proteoglycan was in a ratio of 1:0.6:0.03 , suggesting molar ratios of approximately 1:1:0.2 , respectively .
C0004799
basement membrane
C0022984
laminin