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Apoptosis by TUNEL and related Bax and Bcl-2 by immunohistochemistry in normal colon. (A) Hematoxylin-eosin staining. (B) Apoptotic cells by TUNEL (red arrows indicate the representative apoptotic cells). (C) Expression of protein Bax in normal human colon. (D) Bcl-2 expression in normal colon. Bars: B = 80 μm; A,C,D = 40 μm.
