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refers to a group of cells fluorescent for dopamine in a few species, such as sheep, and immunoreactive for tyrosine hydroxylase, a precursor of dopamine, in many other species including rodents and primates. It is located in ventral and dorsal components within the preoptic periventricular nucleus and adjacent parts of the anterior hypothalamic region. It is continuous caudally with the dopaminergic group A14 ( Tillet-1994 ).
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