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DNA sequences investigated. Position of donor, tCO, in red and acceptor, tCnitro, in green. Cytosines marked by a star are methylated unless they are replaced by tCnitro. In the hemimethylated sequence the donor strand containing tCO is not methylated. The DX and AY notation of sequences reflect the position of the donor, D, and the acceptor, A, in the sequence. The red box marks expected position of the extruded base pair according to literature (16,17).
