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Circular dichroism (CD) spectra of boron cluster-modified oligonucleotides (A,B) and their duplexes (C,D) with complementary strands. (A) Spectra of oligodeoxyribonucleotides; (B) spectra of oligoribonucleotides; (C) spectra of DNA duplexes; (D) spectra of RNA duplexes. Conditions: 25 °C, 10 mM sodium phosphate (pH 7.5), 100 µM oligonucleotides.
