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Representative results of CRC case showing paMMR-IHC and MSS by PCR. (A) MMR-IHC results: patchy expression of MLH1 and PMS2 in tumor cells with positive internal control (original magnification 10×); intact expression of MSH2 and MSH6 in tumor cells (original magnification 10×). (B) MSS-PCR results: stability of BAT25, BAT26, NR21, NR22, NR24, NR27, CAT25 and MONO27 (red lines indicate samples while blue lines indicate MSS controls).
