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Scheme showing the examples of complexes of PNA with double-stranded DNA: (a) triplex invasion, (b) triplex, (c) tail clamp, (d) duplex invasion, (e) double duplex invasion. Red lines —PNA backbone; black lines—DNA; blue dashed lines—Watson–Crick hydrogen bonds; green dashed lines—Hoogsteen-type hydrogen bonds; *—modified nucleotide bases [35].
