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. Author manuscript; available in PMC: 2014 Aug 22.
Published in final edited form as: Rep Prog Phys. 2005 Jan;68(1):237–270. doi: 10.1088/0034-4885/68/1/R05

Figure 2. Sticky Ended Cohesion and Branched DNA.

Figure 2

(a) Affinity in Sticky Ended Cohesion. Two double helical strands with complementary overhangs are shown. Under appropriate conditions, they will cohere in a sequence-specific fashion, and can be ligated, if desired. (b) Structure in Sticky-Ends. A portion of the crystal structure of an infinite DNA double helix formed by sticky-ended cohesion is shown. The part cohering by sticky ends is in the red box, whereas the blue boxes surround continuous DNA segments. The DNA in all three sections is B-DNA. (c) A Stable Branched Junction. There is no dyad symmetry flanking the branch point; tetramers, such as the boxed sequences CGCA and GCAA are unique, and there is no TCAG to complement the CTGA flanking the corner.