( PROTEINS ( ( are ( ( large ( , ( complex molecules ) ) ) ( consisting ( of ( ( smaller subunits ) ( called ( AMINO ACIDS ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS PROTEINS)) (VP (VBP are) (NP (NP (JJ large) (, ,) (JJ complex) (NNS molecules)) (VP (VBG consisting) (PP (IN of) (NP (NP (JJR smaller) (NNS subunits)) (VP (VBN called) (NP (NNP AMINO) (NNP ACIDS)))))))) (. .)))
PROTEINS are large, complex molecules consisting of smaller subunits called AMINO ACIDS.
(ROOT (S (NP (DT A) (NN protein)) (VP (VBZ is) (NP (NP (DT an) (JJ organic) (NN compound)) (VP (VBN made) (PRT (RP up)) (PP (IN of) (NP (NP (JJ small) (NNS molecules)) (VP (VBN called) (NP (JJ amino) (NNS acids)))))))) (. .)))