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Scanning electron micrographs of tangential sections through grapevine and associated xylem vessels. (A) Water-conducting xylem vessels (several of which are noted within the white square) of a grapevine cross section serve as the habitat for X. fastidiosa cells. Bar, 200 μm. (B) View into a sectioned xylem vessel with X. fastidiosa cells attached to the vessel walls. Bar, 10 μm.
