the distribution of four basement membrane components , type iv collagen ( c iv ) , laminin ( lm ) , heparan sulfate proteoglycan ( hsp ) and fibronection ( fn ) has been studied by indirect immunofluorescence using specific antibodies , in benign and malignant proliferations of the mammary gland and in soft tissue tumors .
C0004799
basement membrane
C0009333
type iv collagen