( Furthermore ( , ( ( genes ( identified ( in ( GWAS ( for ( drug addiction ) ) ) ) ) ) ( ( may ( be ( ( involved either ) ( in ( ( adjusting ( brain behavior ) ) ( prior ( to ( ( ( ( ( ( drug experiences ) , ) ( subsequent ( to them ) ) ) , ) or ) both ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Furthermore)) (, ,) (NP (NP (NNS genes)) (VP (VBN identified) (PP (IN in) (NP (NP (NNS GWAS)) (PP (IN for) (NP (NN drug) (NN addiction))))))) (VP (MD may) (VP (VB be) (VP (VBN involved) (ADVP (RB either)) (PP (IN in) (S (VP (VBG adjusting) (NP (NN brain) (NN behavior)) (PP (RB prior) (PP (TO to) (NP (NP (NN drug) (NNS experiences)) (, ,) (NP (NP (JJ subsequent)) (PP (TO to) (NP (PRP them)))) (, ,) (CC or) (NP (DT both))))))))))) (. .)))
Furthermore, genes identified in GWAS for drug addiction may be involved either in adjusting brain behavior prior to drug experiences, subsequent to them, or both.
(ROOT (S (NP (NNP Animal) (NNS behaviors)) (VP (VBP are) (VP (VBN controlled) (PP (IN by) (NP (NP (DT both) (NNS genes) (CC and) (NNS experiences)) (PP (IN in) (NP (DT a) (VBN given) (NN envionment))))))) (. .)))