( Proteins ( ( are ( ( ( necklaces ( of ( amino acids ) ) ) -- ) ( long ( chain molecules ) ) ) ) . ) )
(ROOT (S (NP (NNPS Proteins)) (VP (VBP are) (NP (NP (NP (NNS necklaces)) (PP (IN of) (NP (JJ amino) (NNS acids)))) (: --) (NP (JJ long) (NN chain) (NNS molecules)))) (. .)))
Proteins are necklaces of amino acids --- long chain molecules.
(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))))))))) (. .)))