( ( a -RRB- ) ( ( Protein molecules ) ( ( are ( ( made up ) ( of ( ( long chains ) ( of ( amino acids ) ) ) ) ) ) . ) ) )
(ROOT (S (LST (LS a) (-RRB- -RRB-)) (NP (NNP Protein) (NNS molecules)) (VP (VBP are) (VP (VBN made) (PRT (RP up)) (PP (IN of) (NP (NP (JJ long) (NNS chains)) (PP (IN of) (NP (JJ amino) (NNS acids))))))) (. .)))
a) Protein molecules are made up of long chains of amino acids.
(ROOT (S (NP (NNPS Proteins)) (VP (VBP are) (NP (NP (JJ long) (NNS chains)) (PP (IN of) (NP (JJ amino) (NNS acids))))) (. .)))