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Localization of Btk::GFP in petiole. The arrow indicates the presence of Btk::GFP visible in the Xylem of the plant. Fluorescence signal as well as its movement in the xylem was used to ascertain the presence of the bacterium. Many Btk::GFP were visible in the samples although only a few were seen at any time at high resolution due to the narrow focal plane.
