The antibody is reactive with collagen type IV of basement membranes, and shows a homogeneous staining pattern in all tissues. As neoplastic cells of invasive carcinomas often lack a continuous basement membrane, the antiserum is useful to distinguish between non-invasive and invasive lesions. Additionally, it can be used for the differentiation of bullous lesions in dermatopathology. In immunohistochemistry no cross-reactivity with other collagens at optimal dilutions. In immunoblotting, a slight cross-reactivity with collagen type V is observed.
Positive control: Skin, kidney.