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Immunohistochemical staining of human non-small-cell lung cancer tissues using the avidin-biotin-peroxidase complex procedure. Original magnification, ×200. A: Adenocarcinoma with positive bcl-2 expression. B: Squamous cell carcinoma with positive bcl-2 expression. C: Adenocarcinoma with positive bax expression. D: Squamous cell carcinoma with positive bax expression.
