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Expression patterns of CD4, CD8, and CD31 in LLC tumor sections. Immunohistochemical staining of CD4, CD8, and CD31 in lung cancer tissues. Expression of CD4, CD8, and CD31 in LLC tumor xenograft tissues following treatment with PBS, Tα1, and Tα1-RGDR. White arrows represent the positive cytoplasm of CD4, CD8, and CD31 staining (200× magnification). Brown staining indicates positive CD4, CD8, and CD31 expression, whereas blue staining indicates cell nuclei.
