( ( QUATERNARY STRUCTURE ) ( ( is ( based ( on ( ( ( ( two or ) more ) ( folded ( polypeptide chains ) ) ) ( that ( fit together ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP QUATERNARY) (NNP STRUCTURE)) (VP (VBZ is) (VP (VBN based) (PP (IN on) (NP (NP (QP (CD two) (CC or) (JJR more)) (JJ folded) (NN polypeptide) (NNS chains)) (SBAR (WHNP (WDT that)) (S (VP (VBP fit) (ADVP (RB together))))))))) (. .)))
QUATERNARY STRUCTURE is based on two or more folded polypeptide chains that fit together.
(ROOT (S (NP (NNP Insulin)) (VP (VBZ is) (VP (VBN made) (PRT (RP up)) (PP (IN of) (NP (CD two) (JJ polypeptide) (NNS chains))))) (. .)))