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Rights: Louise Goossens, Wellington School of Medicine and Health Sciences Published 29 February 2012 Size: 1.4 MB Referencing Hub media

Scientists use stains to colour their samples of biological tissue before viewing them through light microscopes. Stains highlight particular components of the sample and make it easier to interpret. Here, a human brain tissue sample uses an H&E stain to emphasis the nuclei of the cells (purple).