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Gastric cancer. Immunohistochemical staining for DNA repair proteins. Preserved immuno-expression of MLH1 ((A), 100×), MLH2 ((B), 400×), MSH6 ((C), 400×) and PMS2 ((D), 400×) proteins. (E): Loss of MLH1 expression in tumor cells (positive internal control in accompanying lymphocytes) (400×).
