the contents of da and its main metabolites , dihydroxyphenylacetic acid and homovanillic acid , together with serotonin and its main metabolite , 5-hydroxyindoleacetic acid ( 5-hiaa ) , were measured in different brain areas after direct injection of cck-8 into the ventral tegmental area ( a10 ) or nucleus accumbens .
C0006104
brain
C0028633
nucleus