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refers to a group of cells fluorescent for dopamine and distributed in clusters that, in the primate, are ventral and medial to the mammillothalamic tract of the hypothalamus; a few extend into the reuniens nucleus of the thalamus ( Felten-1983 ). In the mouse A13 is located ventral to the mammillothalamic tract of the thalamus in the zona incerta ( Paxinos-2001 ).
Functionally it belongs to the reticular formation (functional) of the subcortical motor system ( Swanson-2004 ).
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