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A shufflon or clustered inversion is a novel type of DNA rearrangement originally discovered in the IncI1 plasmid R64 (T. Komano, A. Kubo, and T. Nisioka, Nucleic Acids Res. 15:1165-1172, 1987). In a 1.95-kilobase region of R64 DNA, four DNA segments inverted independently or in groups, resulting in a complex DNA rearrangement. We found similar types of shufflon in other IncI1 plasmids, including delta, pIP111, pIP565, pIP112, pIP186, R144, R163, R483, and R621a. A variant type of shufflon occurs in the IncI1 plasmid ColIb.
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Komano et al. (1987) studied this question.
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