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MSH2 and EPCAM expression in colorectal polyps from EPCAM deletion carriers. (a,c) Loss of MSH2 expression in colon adenomas. (b,d) Loss of EPCAM immunostaining only in isolated glands. Staining of normal colonic glands served as the internal positive control in (a,b), and (d). Lymphocytes cells were the internal positive control in (c).
