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Genome alignment of tox+ prophages identified in the sequenced C. diphtheriae strains. The nucleotide sequence alignment was calculated with the software Mauve. The height of the plot denotes the similarities of the aligned DNA sequences. The tox gene is located at the right-hand end of the prophage genome. The proposed modular structure of the corynephage present in C. diphtheriae NCTC 13129 is indicated by annotated brackets.
