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Fig. 5 | BMC Genomics

Fig. 5

From: Systematics for types and effects of DNA variations

Fig. 5

Three dimensional structures of DNA forms. Double helical structures. a A DNA (5iyg) [120], b B DNA (5f9i), c D DNA (5vy6) [121], and (d) Z DNA (4ocb) [122]. e Triple helix structure (1bwg) [125]. Four-stranded DNA structures (f) i motif (PDB entry 1el2) [130], and (g) G-quadruplex (2kzd) [142]. h DNA-RNA hybrid structure of type R loop (5mga) [137]. The DNA backbone is shown in cyan and the nucleotide bases with yellow. In H, the RNA chain backbone is in red

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