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Detection of Methanobrevibacter oralis from a chronic periodontitis specimen using FISH. a Blue color represents DAPI fluorescence staining any DNA b Green color represents mcrA probe staining the methanogen mcrA gene c Red color represents ARC915 fluorescence staining the archaeal DNA d Fluorescent in situ hybridization combining mcrA fluorescence, ARC915 fluorescence and DAPI: the arrow points to archaea. Scale bar, 2 μm
