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Intranasally-administered Colivelin (CLN) in the olfactory bulb (coronal section) was visualized by immunofluorescence staining (‘PO4’ antibody detecting CLN, green; TO-PRO-3 nuclear staining, blue). Courtesy of Drs M Yamada, T Chiba, and S Aiso of Department of Anatomy, KEIO University, School of Medicine.