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H-DNA target and Tn7 insertion profile. The 46-bp mirror repeat sequence capable of forming an intramolecular triplex or H-DNA (H-y3 isomer) is illustrated. Distribution of 85 independent insertions isolated by means of transformation were mapped onto pCW2966. An accumulation of insertions is found on either side of the 46-bp mirror repeat sequence; >98% of these insertions occur such that Tn7's right end is closest to the mirror repeat.
