( Proteins ( ( are ( ( ( long chains ) ( of ( amino acids ) ) ) ( that ( fold ( into ( compact ( ( yet flexible ) shapes ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNPS Proteins)) (VP (VBP are) (NP (NP (JJ long) (NNS chains)) (PP (IN of) (NP (JJ amino) (NNS acids))) (SBAR (WHNP (WDT that)) (S (VP (VBP fold) (PP (IN into) (NP (JJ compact) (ADJP (RB yet) (JJ flexible)) (NNS shapes)))))))) (. .)))
Proteins are long chains of amino acids that fold into compact yet flexible shapes.
(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))))))))) (. .)))