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Colorectal adenocarcinoma (Caco-2) cells after 24-hour culture with 150 ng/ml phorbol 12-myristate 13-acetate (PMA) and methylcobalamin (0, 200, 500, 750, and 1000 pg/ml). (a) Cell activity as measured by MTT; (b) nitric oxide production (∗significantly increased p = 0.0061).
