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Alignment of intron insertion points within gene cassettes in class 1 integrons. All introns are inserted to the 5′ end of an attC site. The same intron was found in the two upper strains. The same intron, but different from the first, is found in the three next strains. A third intron is present in the Nitrosomonas europaea ATCC19718 strain; noncoding DNA is present at the left side of the attC site in this strain.
