( ( In ( its ( purest form ) ) ) ( , ( protein ( ( consists ( of ( chains ( of ( amino acids ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (PRP$ its) (JJ purest) (NN form))) (, ,) (NP (NN protein)) (VP (VBZ consists) (PP (IN of) (NP (NP (NNS chains)) (PP (IN of) (NP (JJ amino) (NNS acids)))))) (. .)))
In its purest form, protein consists of chains of amino acids.
(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))))))))) (. .)))