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Diagrams of the monkey cerebellum showing transneuronal retrograde labeling of Purkinje cells and transneuronal antegrade labeling of mossy fibers after injections of tracers in prefrontal area 46 and the primary motor cortex. Note similarity in the localization of Purkinje cells and granule cells labeled from the same cortical area. Redrawn from Kelly and Strick (2003). Abbreviations: ANT, anterior lobe; PMD, pramedian lobule.
