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Micro-XRF mapping of Zn (red), K (blue), and Ca (green) in the cross-sections of stems collected from healthy (a) and HLB-affected (b) lemon branches. Fluorescence intensities of elements were normalized and subsequently translated to concentrations by using measurements of the standards. Pixel brightness is displayed in RGB with the brightest spots corresponding to the highest concentrations (µg cm–2) for the element depicted. Scale bar: 200 µm.
