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Examples of biological X-ray fluorescence imaging (XFI), illustrating the different accessible length-scales. Panel a shows a coronal section of human brain taken post-mortem from an individual suffering from multiple sclerosis,14 with normalized levels of iron, zinc, and copper indicated as shades of red, green, and blue. Panel b shows a thin section of larval zebrafish retina imaged at high resolution showing preferential accumulation of mercury in the photoreceptor cells.15
