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Alignment of the terminal nucleotide sequences of ISPpa3, ISPpa4, and their closest relatives of the IS903 group (IS5 family). The identical residues of ISPpa3 sequences are boldface. Nucleotides of other sequences identical to those of ISPpa3 are boldface and shaded. The putative IRs of ISPpa3 are depicted by a thin bar. “L” denotes sequences at the 5′ (left) end, and “R” denotes complementary sequences at the 3′ (right) end of the elements.
