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Examples of IHC as an Immunotherapy Biomarker in Colorectal Cancer: (a) Colorectal cancer H&E 10× magnification; (b) CRC intact expression of MSH2 20×; (c) MSH6 expression 30×; (d) loss of MLH1 20×; (e) loss of PMS2 20×. Micrographs provided by R.F. S.J.H.
