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B-DTJ: interaction of nucleotide −1R with base pair [−1P;−1Q]. In all B-DTJs, nucleotide −1R is either adenosine or cytosine. The arrangement of nucleotides at level −1 in motif 1NBS-232 is practically identical to that of 2AW4-1902. In motif 1U9S-161, nucleotide −1R (A137) is located too far from −1P (C160) to make any interaction.
