other indications of decreased brain dopamine turnover after lergotrile included ( a ) a slower decline in dopamine concentration after synthesis inhibition by alpha-methyltyrosine , ( b ) a slower decline in alpha-methyl-m-tyramine , a false transmitter that is stored and released by dopamine neurons , and ( c ) a decreased accumulation of dopamine in response to gamma-butyrolactone , an agent that blocks firing and dopamine release by dopamine neurons .
C0006104
brain
C0086045
concentration