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Immunostaining with anti-CD31 antibody to detect endothelial cells. Rust color indicates positive immunostaining. A lower power image is on the left (A) and a higher power image of a section of the same vein is shown on the right (B). Endothelial cells lining the vein lumen are highlighted. Positive immunostaining of microvessels in the neointima and adventitia is visible in (B), suggesting neoangiogenesis in these regions.
