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We examined cell surface expression of five B7 costimulatory molecules (B7-H1, B7-DC, B7h, CD80 and CD86) in human oral squamous cell carcinoma (SCC) lines. Most human SCC cell lines expressed various levels of B7-H1 and B7-DC. Their expression was further upregulated by interferon (IFN)-γ stimulation. Immunohistochemical staining revealed substantial and predominant expression of B7-H1 on human primary...
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