( ( The ( two enzymes ) ) ( ( differ ( at ( ( one ( amino ( acid position ) ) ) ( in ( the protein ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (CD two) (NNS enzymes)) (VP (VBP differ) (PP (IN at) (NP (NP (CD one) (JJ amino) (NN acid) (NN position)) (PP (IN in) (NP (DT the) (NN protein)))))) (. .)))
The two enzymes differ at one amino acid position in the protein.
(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)))))) (. .)))