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Mismatch repair (MMR) deficiency is a common feature of acute lymphoblastic leukaemia (ALL) cell lines and in some cases is due to the mutations of hMLH1 which affect mRNA splicing. Therefore, we have analysed alternative splicing of hMLH1 in a cohort of children with ALL. We show that alternative splicing of hMLH1 is highly variable in normal and leukaemic cells and can occur by exon skipping or...