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The cohesive nucleotides are indicated by orange base pairs. (a) Single Sticky Ended Cohesion. A single helix coheres with another helix through a single sticky-end pair. (b) Double Sticky-Ended Cohesion. Two branched molecules are shown, and they cohere with each other twice. Note that these molecules show only one half of each of the DX molecules that they represent; otherwise the junctions would not form two collinear arrangements.
