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1H NMR spectra of the far downfield imino proton region at 5°C and pH 6.8. (A) The unadducted duplex d(GGTGTCCG)⋅ d(CGGACACC). (B) The duplex d(GGTXTCCG)⋅d(CGGACACC). (C) The duplex d(GGTMTCCG)⋅d(CGGATACC). (D) The duplex d(ATCGCXCGGCATG)⋅d(CATGCCGCGCGAT).
