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5-nucleotide bulge.

A bulge is a region of unpaired bases with two adjoining stacks. In a bulge, the unpaired bases are only found on one side of the molecule. This differs from an internal loop, where unpaired bases are found on both sides.

Nomenclature[]

Bulges are typically described by the number of unpaired bases. In the illustration to the right, 5 bases are unpaired.

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