( ( Since screening ) ( , ( ( individuals ( with ( PKU ( who ( ( are correctly ) ( ( treated ( by diet ) ) ( during ( ( infancy and ) childhood ) ) ) ) ) ) ) ) ( ( ( grow up ) ( with ( normal intelligence ) ) ) . ) ) ) )
(ROOT (S (PP (IN Since) (NP (NN screening))) (, ,) (NP (NP (NNS individuals)) (PP (IN with) (NP (NP (NNP PKU)) (SBAR (WHNP (WP who)) (S (VP (VBP are) (ADVP (RB correctly)) (VP (VBN treated) (PP (IN by) (NP (NN diet))) (PP (IN during) (NP (NN infancy) (CC and) (NN childhood)))))))))) (VP (VBP grow) (PRT (RP up)) (PP (IN with) (NP (JJ normal) (NN intelligence)))) (. .)))
Since screening, individuals with PKU who are correctly treated by diet during infancy and childhood grow up with normal intelligence.
(ROOT (S (NP (DT An) (NN individual)) (VP (VP (VBZ grows) (ADVP (RB quickly))) (CC and) (VP (VBZ develops) (NP (JJ new) (NNS abilities)) (PP (IN during) (NP (PRP$ their) (NN infancy) (CC and) (NN childhood))))) (. .)))
An individual grows quickly and develops new abilities during their infancy and childhood.