Expression of C7 on ECs of blood vessels in various tissues. Sections of paraffin-embedded human skin, kidney, brain, endometrium, and decidua were stained for C7 using goat IgG anti–human C7 or control IgG. Bound antibodies were revealed with the LSAB⁺ horseradish peroxidase (HRP) kit and 3-amino-9-ethylcarbazole (AEC) as chromogen. The sections were counterstained with hematoxylin. Magnification bar represents 30 μm.