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Lamellar structure of the main (MOB) and accessory olfactory bulb (AOB) in the rat. ①~⑥: MOB, 1’~6’: AOB, ①: olfactory nerve layer, ②: glomerular layer, ③: external plexiform layer, ④: mitral cell layer, ⑤: internal plexiform layer, ⑥: granule cell layer, 1′: vomeronasal nerve layer, 2′: glomerular layer, 3′: mitral/tufted cell layer, 4′: plexiform layer, 5′: lateral olfactory tract, 6′: granule cell layer.
