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Three-colour single-molecule fluorescent in situ hybridization is used by van Oudenaarden and colleagues to show overlapping expression of intestinal stem-cell markers during homeostasis, ageing and regeneration. This approach can help identify putative stem cells in tissues and tumours, and can guide functional studies.
Genome editing mediated by zinc finger nucleases can be used to generate fluorescently labelled proteins that are expressed at endogenous levels from their native genetic loci. Applying this technology to the clathrin light chain A and dynamin-2 loci reveals that clathrin-mediated endocytosis is more regular and efficient than previously thought.
