brains were quickly removed and the caudate-putamen , nucleus accumbens , septum , and preoptic area/anterior hypothalamus were frozen and saved for later estimation of dopamine ( da ) and two neural metabolites of da , 3,4-dihydroxyphenylacetic acid ( dopac ) and homovanillic acid ( hva ) .
C0006104
brains
C0028633
nucleus accumbens