Figure 2

Integron recombination sites. (a) Sequence of the double strand (ds) attI1 site. (b) Sequence of the ds attC _ant(3'')-Ia site. (c) Secondary structure of the folded bottom strand of the attC _ant(3'')-Ia site, according to MFOLD (http://mfold.bioinfo.rpi.edu/cgi-bin/dna-form1.cgi). The inverted repeats L, 1L, and 2L, R, 1R and 2R are shown by horizontal black arrows. The attI1 direct repeats bound by IntI1 are indicated by horizontal lines with an empty arrowhead. The crossover positions are indicated by vertical arrows and the extrahelical bases are identified by asterisks.