Abstract
The 190 kDa outer membrane protein of Rickettsia rickettsiiis a major immunodominant protective antigen which contains 13 tandem nearly identical repeating sequences. We have identified a deletion in the 190 kDa antigen gene of R. rickettsiistrain Smith maintained in the laboratory. The deletion occurred within the repeat region of this gene and the mutated repeat region corresponded to one repeating unit in size.
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