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Scanning electron micrographs comparing biofilm formation of S. mutans UA159 (wild type), TJ-relA, and JL-ΔrelA on the surfaces of HA disks. Images shown were obtained at ×1,500 (A, D, and G), ×6,000 (B, E, and H), and ×13,000 (C, F, and I) magnification.
