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Expression patterns of mucins MUC1, MUC2, MUC4, and MUC5AC in colorectal cancer. MUC1 (a) and MUC4 (c) are expressed mostly on the apical membrane of tumor cells, whereas MUC2 (b) and MUC5AC (d) are expressed in the cytoplasm of tumor cells. Magnification, ×200.
