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Schematic representation of B. abortus 2308 virB operon and comparison with B. suis 1330 virB, A. tumefaciens virB, and B. pertussis ptl operons. The white bar denotes the 18-bp inversion of the B. abortus 2308 RS with respect to the B. suis 1330 virB operon. The homologues between ptl and virB are shown in parentheses.
