( ( The enzyme ) ( ( is ( composed ( of ( ( two ( polymer chains ) ) ( which ( are polypeptides ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN enzyme)) (VP (VBZ is) (VP (VBN composed) (PP (IN of) (NP (NP (CD two) (JJ polymer) (NNS chains)) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (ADJP (JJ polypeptides))))))))) (. .)))
The enzyme is composed of two polymer chains which are polypeptides.
(ROOT (S (NP (NNP Insulin)) (VP (VBZ is) (VP (VBN made) (PRT (RP up)) (PP (IN of) (NP (CD two) (JJ polypeptide) (NNS chains))))) (. .)))