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SEM of S. gordonii biofilms. S. gordonii strains (WT, ΔltaS, and ΔltaSc) were allowed to form biofilm on saliva-coated hydroxyapatite disks for 12 h. Biofilms were visualized at ×2,500 (A [WT strain], B [ΔltaS strain], and C [ΔltaSc strain]) and ×20,000 (D [WT strain], E [ΔltaS strain], and F [ΔltaSc strain]).
