these results suggest that basement membrane of human corneal/conjunctival epithelium can be divided into at least three domains : the conjunctival basement membrane ( type iv collagen-positive , ae27-weak ) , the limbal basement membrane ( type iv collagen-positive , ae27-strong ) , and corneal basement membrane ( type iv collagen-negative , ae27-strong ) .
C0004799
basement membrane
C0009333
type iv collagen