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. 2021 Aug 16;14:4485–4497. doi: 10.2147/OTT.S324641

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© 2021 Song et al.

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Detection of MMR protein expression by IHC. (A and B) Loss of MLH (A) and PSM2 (B) staining. (C and D) Intact MSH2 (C) and MSH6 (D) staining. Note the presence of nuclear staining in adjacent glands and benign stromal cells, validating the IHC method. Scale bars: 100 μm.