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Structures and frontier orbitals (red/blue) for (A) LNA tri-nucleotide with sequence 5′-AAG-3′, and (B) LNA penta-nucleotide with sequence 5′-AAGAC-3′. The 5′ end is at the bottom in (A) and is at the top in (B). The electrostatic potential (negative) is shown in gray and represented by an Iso-potential value of −83 kJ/mol.
