Ψ
 Medical Concepts
  Organisms
 Bacteria
 Gram-Negative Bacteria
 Gram-Negative Anaerobic Bacteria
 Gram-Negative Anaerobic Straight, Curved, and Helical Rods
 Bacteroidaceae
 Bacteroides
 Porphyromonas
 Porphyromonas endodontalis
 Porphyromonas gingivalis
 Prevotella

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