( Neuroleptics ( ( ( block ( dopamine ( D2 receptors ) ) ) ( in ( the brain ) ) ) . ) )
(ROOT (S (NP (NNS Neuroleptics)) (VP (VBP block) (NP (JJ dopamine) (NN D2) (NNS receptors)) (PP (IN in) (NP (DT the) (NN brain)))) (. .)))
Neuroleptics block dopamine D2 receptors in the brain.
(ROOT (S (NP (NNP Addiction)) (VP (VBZ affects) (NP (NP (DT the) (JJ dopamine) (NNS receptors)) (PP (IN within) (NP (DT the) (NN brain))))) (. .)))