this was done by injecting rhodamine-filled latex microspheres into the nucleus tractus solitarii of rats to retrogradely label neuronal cell bodies and by processing sections from the brains of these animals to determine if the labelled neurons were immunoreactive for the catecholamine-synthesizing enzymes , dopamine-beta-hydroxylase ( dbh ) and phenylethanolamine-n-methyl transferase ( pnmt ) .
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the nucleus tractus solitarii of
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brains