( It ( ( enters ( ( ( the brain ) , ) ( where ( it ( ( ( acts ( on ( dopamine receptors ) ) ) , ) ( stabilizing ( ( the ( chemical instability ) ) ( -LRB- ( ( your illness ) -RRB- ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ enters) (NP (NP (DT the) (NN brain)) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (PRP it)) (VP (VBZ acts) (PP (IN on) (NP (JJ dopamine) (NNS receptors))) (, ,) (S (VP (VBG stabilizing) (NP (NP (DT the) (JJ chemical) (NN instability)) (PRN (-LRB- -LRB-) (NP (PRP$ your) (NNS illness)) (-RRB- -RRB-)))))))))) (. .)))
It enters the brain, where it acts on dopamine receptors, stabilizing the chemical instability (your illness).
(ROOT (S (NP (NNP Addiction)) (VP (VBZ affects) (NP (NP (DT the) (JJ dopamine) (NNS receptors)) (PP (IN within) (NP (DT the) (NN brain))))) (. .)))