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a–d. Root tissues and bacteria stained with SYTO9 florescent nucleic acid stain. a and b Root hairs showing epiphytic swollen oxidizing bacteria (arrows) with intact bacteria in background; c Root parenchyma showing intensely staining intact bacteria (yellow arrows) and masses of oxidizing bacteria (blue arrow); d Root parenchyma showing nucleic acid rings (bulls-eye rings) around oxidizing bacteria (arrows)
