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Oligo(nucleoside Phosphorothioate)s: The Quest of P-Chirality

The influence of the sense of chirality at phosphorus of internucleotide phosphorothioate groups in oligo(nucleoside phosphorothioate)s is discussed in terms of stability of stereodefined PS-Oligos in the intra- and intercellular media and newly discovered exclusive ability of R P -PS-Oligos containing homopurine tracts towards the formation of triple-stranded species of one phosphorothioate and two complementary RNA strands stechiometry.