using immunohistochemistry , the distribution patterns of basement membrane components type vii collagen ( monoclonal antibody lh7.2 ) , type iv collagen , and laminin were investigated in normal and malignant human breast tissue and compared with that of keratin 14 ( monoclonal antibody ll002 ) , which is expressed only by the basal ( myoepithelial ) cells in the secretory epithelia of the mammary gland .
C0004799
basement membrane
C0009333
type iv collagen