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R. rickettsii R strain and R. rickettsii Iowa plaque variants. (A) R. rickettsii R strain clear- and opaque-plaque variants. (B) Representative growth curves for the R. rickettsii R strain clear- and opaque-plaque variants. (C) R. rickettsii Iowa clear- and opaque-plaque variants. (D) Representative growth curves for the R. rickettsii Iowa clear- and opaque-plaque variants. Error bars represent standard errors of the means (SEM).
