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Immunohistochemical staining for MSH6 in colon cancer: (A) Positive nuclear immunostaining for MSH2 in normal intestinal mucosa (left upper corner) and in tumor cells (×100); (B) Strong positive nuclear immunoreactivity for MSH6 in tumor cells (×200); (C) Absence of nuclear immunostaining for MSH6 in tumor cells in a mucinous colon cancer (×200). MSH6: mutS homologue 6
