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Transposition loci of Tn4400′ in the kgp genes from two mutant strains. The orientations of Tn4400′ in two strains were as indicated. L denotes IS4400L, and R denotes IS4400R. Nucleotide numbering was based on the kgp gene from P. gingivalis 381 (NCBI accession no. D83258). Numbers in parentheses denote the corresponding amino acid positions. Underlined nucleotides are the duplication target sites resulting from the transposition event.
