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    Structural studies of symmetric DNA undecamers containing non-symmetrical sheared (PuGAPu):(PyGAPy) motifs

    Interstrand purine-purine stacks originate from tandem sheared purine•purine pairing and represent one of the most important motifs in both DNA and RNA structures. Several RNA and DNA structures, solved recent...

    Shan-Ho Chou, Yu-Yu Tseng, Yang-Ren Chen, Jya-Wei Cheng in Journal of Biomolecular NMR (1999)