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. 2003 Jul 18;100(16):9214–9219. doi: 10.1073/pnas.1533326100

Table 3. Comparison between nucleic acid intercalated structures.

CA step involved? Strands Base pairing Unusual features Ref.
Helix intercalation Yes Antiparallel Watson-Crick H bond Two strands This work
I-DNA Yes Parallel C·C or A·A Four strands 13-17 and 20
Zipper-like DNA Yes Antiparallel Non-base pairing Induced by sheared G·A mismatches 22