( Dopamine ( ( is ( ( a neurotransmitter ) ( with ( ( ( ( four or ) more ) ( different receptors ) ) ( in ( the brain ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Dopamine)) (VP (VBZ is) (NP (NP (DT a) (NN neurotransmitter)) (PP (IN with) (NP (NP (QP (CD four) (CC or) (JJR more)) (JJ different) (NNS receptors)) (PP (IN in) (NP (DT the) (NN brain))))))) (. .)))
Dopamine is a neurotransmitter with four or more different 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))))) (. .)))