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Representative histology and immunohistochemistry results. A microsatellite instability-high (MSI-H) case (A) exhibiting the loss of the expression of hMLH1 (B) and the intact expression of hMSH2 (C). Stromal lymphocytes were used as an internal positive control. The intact expression of hMLH1 (E) and hMSH2 (F) was evident in a microsatellite stable case (D).
