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X-ray, phylogenetic and quantum chemical analysis of molecular interactions and conservation patterns of cis Watson-Crick (W.C.) A/G base-pairs in 16S rRNA, 23S rRNA and other molecules was carried out. In these base-pairs, the A and G nucleotides interact with their W.C. edges with glycosidic bonds oriented cis relative to each other. The base-pair is stabilised by two hydrogen bonds, the C1'-C1'...
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