type iv collagen from these cultures was biochemically identified on the basis of ( 1 ) the high ratio of labeled 3-hydroxyproline to 4-hydroxyproline ( 1:10 ) , ( 2 ) the gel electrophoretic pattern of the collagenase-sensitive proteins precipitated with 1.7 m nacl , ( 3 ) the failure of the collagen to bind to diethylaminoethyl-cellulose , and ( 4 ) the immunologic cross-reactivity with mouse tumor type iv is identical with that of type iv collagen from other sources .
C0009325
collagen
C0009333
type iv collagen