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Analysis of the Flp-bound DNA structure. A, minor groove width. Note that it becomes narrow in the A/T-rich region near the scissile phosphate. The dashed line represents the average minor groove width for canonical B DNA. B, roll angles between base pairs. Both plots were made using 3DNA version 1.5 (30). Three examples of the Flp binding site were taken from structures determined in two different space groups (PDB codes 1FLO and 1M6X).
