( ( A ( protein molecule ) ) ( ( consists ( of ( ( long ( twisted ( ( strands or ) chains ) ) ) ( of ( amino acids ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN protein) (NN molecule)) (VP (VBZ consists) (PP (IN of) (NP (NP (JJ long) (JJ twisted) (NNS strands) (CC or) (NNS chains)) (PP (IN of) (NP (JJ amino) (NNS acids)))))) (. .)))
A protein molecule consists of long twisted strands or 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))))) (. .)))