( ( ( ( Some enzymes ) and ) ( other proteins ) ) ( ( have ( ( quaternary structure ) ( -LRB- ( ( ( ( ( two or ) more ) ( polypeptide chains ) ) ( ( get together ) ( to ( make ( the protein ) ) ) ) ) -RRB- ) ) ) ) . ) )
(ROOT (S (NP (NP (DT Some) (NNS enzymes)) (CC and) (NP (JJ other) (NNS proteins))) (VP (VBP have) (NP (NP (JJ quaternary) (NN structure)) (PRN (-LRB- -LRB-) (S (NP (QP (CD two) (CC or) (JJR more)) (JJ polypeptide) (NNS chains)) (VP (VBP get) (ADVP (RB together)) (S (VP (TO to) (VP (VB make) (NP (DT the) (NN protein))))))) (-RRB- -RRB-)))) (. .)))
Some enzymes and other proteins have quaternary structure (two or more polypeptide chains get together to make the protein).
(ROOT (S (NP (NNP Insulin)) (VP (VBZ is) (VP (VBN made) (PRT (RP up)) (PP (IN of) (NP (CD two) (JJ polypeptide) (NNS chains))))) (. .)))