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a. The A, B and C regions of GKN1 gene promoter delimited by the corresponding primer pairs (F1-R1, F2-R2, F3-R3) are boxed. The length of the 5′ UTR of GKN1 mRNA is indicated by double arrows. +1 indicates the position of the start codon. b. Scheme showing the proposed mechanism of histone/SUV39H1 actions on GKN1 gene promoter.
