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Genetic structures of TroRABCD-like systems in streptococci. Arrows indicate the direction of transcription, and break lines represent great distance in the genome. Genetic structure analyses were according to the following genomes: S. suis SC84, NC_012924.1; S. pyogenes M1, NC_002737.2; S. pneumoniae D39, NC_008533.2; S. gordonii CH1, NC_009785.1; S. parasanguinis FW213, NC_017905.1; and S. mutans UA159, NC_004350.2.
