LOOP
LOOPS
INTERNAL LOOP
HAIRPIN LOOP
BULGES
FLIPPED-OUT BASES
STICKY ENDS
OVERHANGING BASES
5'-UU-OVERHANG
CYCLIC
PARALLEL HELIX
CONTINUOUS HELIX
HAMMERHEAD
HAMMERHEAD DNA-RNA RIBOZYME
RNA HAMMERHEAD RIBOZYME
TETRAPLEX
PARALLEL-STRANDED TETRAPLEX
TETRAMERIC AGGREGATE
BASE TRIPLET
INTERMOLECULAR BASE TRIPLET
NICKED
SHIFTED BASE PAIRS
OPEN HELIX
OPEN
CLOSED
BASE INTERCALATED
RACEMATE
A-DNA LIKE CONFORMATION AT TERMINI
Z-DNA STEM
2'-5' PHOSPHODIESTER BOND