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Immunohistochemical staining for MLH1 in colon cancer: (A) Positive nuclear immunostaining for MLH1 in tumor cells and normal intestinal mucosa (upper right corner) (×100); (B) Strong nuclear immunoreactivity for MLH1 in tumor cells (×200); (C) MLH1 loss in tumor cells, with positive internal control of stromal lymphocytes (×200). MLH1: mutL homologue 1
