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Filaments and rods of several genera intermingle at micron scales in an annulus of the hedgehog structure. The two images shown are from methacrylate-embedded, sectioned plaque from two different donors. Both samples were hybridized with probes for Corynebacterium, Fusobacterium, Leptotrichia, Streptococcus, Porphyromonas, Haemophilus/Aggregatibacter, and Neisseriaceae; the probe set in Upper also included a probe for Capnocytophaga.
