( ( A protein ) ( ( is ( ( a molecule ) ( consisting ( of ( ( a ( long chain ) ) ( of ( amino acids ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN protein)) (VP (VBZ is) (NP (NP (DT a) (NN molecule)) (VP (VBG consisting) (PP (IN of) (NP (NP (DT a) (JJ long) (NN chain)) (PP (IN of) (NP (JJ amino) (NNS acids)))))))) (. .)))
A protein is a molecule consisting of a long chain 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))))) (. .)))