Figure 2From: Cruciform structures are a common DNA feature important for regulating biological processesConformations of a cruciform structure. Conformations of a cruciform can vary from (A) "unfolded" with 4-fold symmetry to (B) bent, and to (C) "stacked" with 4 chains of DNA in close vicinity. D) Topology of a Holliday junction stabilized by a psoralen cross-linking agent (PDBID 467D). Here, the junction takes the form of an anti-parallel stacked x-structure.Back to article page