( ( ( The ( left side ) ) ( of ( the brain ) ) ) ( ( ( ( ( ( tends ( to ( have ( ( higher concentrations ) ( of ( dopamine ( than ( ( the right ) ( in ( ( schizophrenia , ) ( which ( ( ( is probably ) not ) ( due ( to ( ( an overproduction ) ( of dopamine ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) , ) but ) ( to ( an increase ) ) ) ( in ( ( chemical receptors ) ( that ( ( ( attract and ) lock ) ( dopamine ( to ( ( the parts ) ( of ( ( the brain ) ( that ( have ( been damaged ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ left) (NN side)) (PP (IN of) (NP (DT the) (NN brain)))) (VP (VP (VBZ tends) (S (VP (TO to) (VP (VB have) (NP (NP (JJR higher) (NNS concentrations)) (PP (IN of) (NP (NP (NN dopamine)) (PP (IN than) (NP (NP (DT the) (NN right)) (PP (IN in) (NP (NP (NN schizophrenia)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADVP (RB probably)) (RB not) (ADJP (JJ due) (PP (TO to) (NP (NP (DT an) (NN overproduction)) (PP (IN of) (NP (NN dopamine)))))))))))))))))))) (, ,) (CC but) (PP (TO to) (NP (DT an) (NN increase))) (PP (IN in) (NP (NP (NN chemical) (NNS receptors)) (SBAR (WHNP (WDT that)) (S (VP (VBP attract) (CC and) (VBP lock) (NP (NP (NN dopamine)) (PP (TO to) (NP (NP (DT the) (NNS parts)) (PP (IN of) (NP (NP (DT the) (NN brain)) (SBAR (WHNP (WDT that)) (S (VP (VBP have) (VP (VBN been) (VP (VBN damaged))))))))))))))))) (. .)))
The left side of the brain tends to have higher concentrations of dopamine than the right in schizophrenia, which is probably not due to an overproduction of dopamine, but to an increase in chemical receptors that attract and lock dopamine to the parts of the brain that have been damaged.
(ROOT (S (NP (NNP Addiction)) (VP (VBZ affects) (NP (NP (DT the) (JJ dopamine) (NNS receptors)) (PP (IN within) (NP (DT the) (NN brain))))) (. .)))