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Schematic of the main olfactory bulb circuit with the (top) interglomerular-interneuron and (bottom) mitral-granule-mitral pathways highlighted. ONL, olfactory nerve layer; GL, glomerular layer; EPL, external plexiform layer; MCL, mitral cell layer; IPL, internal plexiform layer; GrL, granule cell layer; PG, periglomerular cell; SA, short axon cell; ET, external tufted cell; MC, mitral cell; GC, granule cell.
