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Electron micrographs. Thin-section transmission electron micrographs after 18 h in a model biofilm of (A) Fusobacterium nucleatum alone, (B) F. nucleatum with Porphyromonas gingivalis, (C) F. nucleatum with Streptococcus gordonii, or (D) F. nucleatum with both P. gingivalis and S. gordonii. Magnification: ×49,000.
