( ( 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 (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN protein)) (VP (VBZ is) (VP (VBN formed) (SBAR (WHADVP (WRB when)) (S (NP (JJ amino) (NNS acids)) (VP (VBP are) (VP (VBN linked) (ADVP (RB together)) (PP (IN in) (NP (DT a) (JJ long) (NN chain))))))))) (. .)))