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Morphological characteristics in BM medium. (A) Twenty-four-hour cultures of the brpA-deficient strain TW14 (tube 2) and its parent S. mutans UA159 (tube 1). (B and C) Phase-contrast microscopy of the 24-h cultures of UA159 and the brpA mutant, respectively (magnification, ×900). Data are representative of no fewer than three separate experiments.
