( It ( ( is ( ( a dimer ) ( of ( ( ( two protomers ) , ) ( ( each protomer ) ( being ( composed ( of ( 11 ( polypeptide chains ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (NP (NP (DT a) (NN dimer)) (PP (IN of) (NP (NP (CD two) (NNS protomers)) (, ,) (NP (NP (DT each) (NN protomer)) (VP (VBG being) (VP (VBN composed) (PP (IN of) (NP (CD 11) (JJ polypeptide) (NNS chains)))))))))) (. .)))
It is a dimer of two protomers, each protomer being composed of 11 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))))) (. .)))