( ( ( A ( multiprotein complex ) ) ( -LRB- ( or ( ( protein complex ) -RRB- ) ) ) ) ( ( is ( ( a group ) ( of ( ( ( two or ) more ) ( associated ( polypeptide chains ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (NN multiprotein) (NN complex)) (PRN (-LRB- -LRB-) (CC or) (ADJP (RB protein) (JJ complex)) (-RRB- -RRB-))) (VP (VBZ is) (NP (NP (DT a) (NN group)) (PP (IN of) (NP (NP (QP (CD two) (CC or) (JJR more))) (VP (VBN associated) (NP (JJ polypeptide) (NNS chains))))))) (. .)))
A multiprotein complex (or protein complex) is a group of two or more associated polypeptide chains.
(ROOT (S (NP (NNP Insulin)) (VP (VBZ is) (VP (VBN made) (PRT (RP up)) (PP (IN of) (NP (CD two) (JJ polypeptide) (NNS chains))))) (. .)))