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Biofilm formation by S. mutans UA159 (wild type) and its derivatives. Cultures were grown in a microtiter plate containing BM supplemented with glucose (A) or sucrose (B) at 37°C for 24 h. The graph shows the averages and standard deviations (error bars) of the results of three independent experiments. Asterisks indicate results that differ significantly from the results for UA159 (P ≤ 0.05; Student's t test).
