DOUGLAS FARMER, SENIOR EDITOR [email protected]The olfactory system that lets mammals detect and identify odors starts with a wide array of G-protein-coupled receptors (GPCRs), which are located on olfactory sensory neurons (OSNs) that comprise the olfactory epithelium, a thin layer of tissue deep within the nose. This network has the capacity to identify and respond to the host of odors that mammals, including humans, come across every day. A 3D SCAPE image of an olfactory epithelium in a mouse. Courtesy of Hillman and Firestein Labs. 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