( Hemoglobin ( ( is ( composed ( of ( ( ( ( ( four ( polypeptide chains ) ) , ) ( two alpha ) ) and ) ( two ( beta chains ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Hemoglobin)) (VP (VBZ is) (VP (VBN composed) (PP (IN of) (NP (NP (CD four) (JJ polypeptide) (NNS chains)) (, ,) (NP (CD two) (NNS alpha)) (CC and) (NP (CD two) (JJ beta) (NNS chains)))))) (. .)))
Hemoglobin is composed of four polypeptide chains, two alpha and two beta 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))))) (. .)))