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Histological and immunohistochemical staining of left-sided colon tissues. a HE staining. b Positive for MUC2 expression. c Positive for MUC5AC expression. d Negative for MUC2 expression. e Positive for MLH1 expression. f Negative for annexin A10 expression. g Staining for the BRAF mutation in codon 600 (GTG → GAG; 20%). h Negative for KRAS expression. i Methylation panel, intermediate methylation epigenotype. j Microsatellite stability
