( Proteins ( ( are ( composed ( of ( ( one or ) ( ( several ( long chains ) ) ( of ( amino acids ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNPS Proteins)) (VP (VBP are) (VP (VBN composed) (PP (IN of) (NP (NP (CD one)) (CC or) (NP (NP (JJ several) (JJ long) (NNS chains)) (PP (IN of) (NP (JJ amino) (NNS acids)))))))) (. .)))
Proteins are composed of one or several long chains of amino acids .
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN protein)) (VP (VBZ is) (VP (VBN formed) (SBAR (WHADVP (WRB when)) (S (NP (JJ amino) (NNS acids)) (VP (VBP are) (VP (VBN linked) (ADVP (RB together)) (PP (IN in) (NP (DT a) (JJ long) (NN chain))))))))) (. .)))