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This image shows neuroblasts migrating from the rostral migratory stream (RMS) toward the olfactory bulb (OB) in the postnatal rodent brain. GAD67-EGFP+ neuroblasts transplanted into the ventricular-subventricular zone (V-SVZ) (green) migrate in chain-like cell aggregates toward the OB through the RMS. After reaching the OB, the neuroblasts are dissociated from the chains to migrate individually and radially toward their final destination, where they differentiate into NeuN+ (magenta) mature interneurons. Fyn-mediated control of cell-cell adhesion is critical for the detachment of chain-forming neuroblasts in the postnatal OB. Blue color indicates Dcx, an immature neuronal marker. (pages 4598–4609).