Figure 6From: Effect of attC structure on cassette excision by integron integrasesSecondary structure of the folded bottom strand of several mutants of the attC dfrA1 site. (a) First set of mutants. (b) Second set of mutants. The extrahelical bases are identified by arrows. The ‡ indicates that the first extrahelical base is located on the opposite side of the folded bottom strand structure.Back to article page