( Proteins ( ( are ( ( these ( ( really long ) molecules ) ) ( formed ( of ( ( ( ( linear chains ) ( of ( amino acids ) ) ) , ) etc. ) ) ) ) ) ; ) )
(ROOT (S (NP (NNPS Proteins)) (VP (VBP are) (NP (NP (DT these) (ADJP (RB really) (JJ long)) (NNS molecules)) (VP (VBN formed) (PP (IN of) (NP (NP (JJ linear) (NNS chains)) (PP (IN of) (NP (JJ amino) (NNS acids))) (, ,) (X (NN etc.))))))) (: ;)))
Proteins are these really long molecules formed of linear chains of amino acids, etc. ;
(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))))))))) (. .)))