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Immunohistochemistry staining of ALDH1 protein in both benign and cancereous colon tissues. A: low ALDH1 protein expression in benign tissues; B: stage I colon cancer showing positive ALDH1 in the cytoplasm of the cells; C: stage II colon cancer with increased ALDH1 expression level; D: stage III colon cancer with high ALDH1 expression. All images were magnified at 400X
