( ( ( Alpha helices ) Proteins ) ( ( consist ( of ( chains ( of ( ( covalently linked ) ( amino acids ) ) ) ) ) ) . ) )
(ROOT (S (NP (ADJP (NNP Alpha) (JJ helices)) (NNPS Proteins)) (VP (VBP consist) (PP (IN of) (NP (NP (NNS chains)) (PP (IN of) (NP (ADJP (RB covalently) (VBN linked)) (JJ amino) (NNS acids)))))) (. .)))
Alpha helices Proteins consist of chains of covalently linked amino acids.
(ROOT (S (NP (JJ Many) (NNS enzymes)) (VP (VBP are) (NP (NP (JJ simple) (NNS proteins)) (VP (VBG consisting) (ADVP (RB entirely)) (PP (IN of) (NP (QP (CD one) (CC or) (JJR more)) (JJ amino) (NN acid) (NNS chains)))))) (. .)))