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Cover legend: Coronal head section of an E16.5 Cxcr4-eGFP transgenic mouse, stained for GFP (green) and peripherin (red). Chemokine receptor CXCR4 is expressed in the olfactory epithelium, olfactory bulb, and peripherin-positive olfactory axons. For more information, see Memi et al. (17527–17537).