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Optical micrograph (top left) and scattered X-ray (XS) and XRF elemental distribution maps of Cu, Zn, and Se (log scale and linear scale) of an A549 cell treated with 5 μM selenite for 24 h. Cu (red), Zn (green), and Se (blue) maps are overlaid to show the colocalization of the elements (Cu/Zn/Se).
