( ( Amino acids ) ( ( ( link together ) ( in ( chains ( to ( form proteins ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Amino) (NNS acids)) (VP (VBP link) (ADVP (RB together)) (PP (IN in) (NP (NP (NNS chains)) (PP (TO to) (NP (NN form) (NNS proteins)))))) (. .)))
Amino acids link together in chains to form proteins .
(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))))))))) (. .)))