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Thin section of a lanthanum-treated strain PAO1 cell. Binding of the metal resulted in increased electron density and a pronounced ruffling of the cell surface (arrow). Bar = 200 nm. (Inset) EDS spectrum derived from a lanthanum-treated cell. The expected position of lanthanum in the spectrum is indicated. Similar results were obtained for strains PAO1 (A+ B+) and rd7513 (A− B−).
