Localization categories for detected chromosome 21 (Chr21) proteins. The Chr21 proteins were localized in a variety of cellular compartments. The images in the left panel represent anti-His staining of Chr21 proteins, with the gene names indicated in the upper left corner of each image. The images in the middle panel show applied counterstaining, with organelles indicated in the upper left corner. The images in the right panel present a merged picture from detection of Ch21 proteins and counterstaining. The scale bar represents 10 μm.