( ( L-Tyrosine ( A ( dietary ( nonessential ( amino acid ) ) ) ) ) ( , ( tyrosine ( ( is ( ( a component ) ( of ( ( thyroxin , ) ( ( a hormone ) ( secreted ( by ( the ( thyroid gland ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (S (VP (VBG L-Tyrosine) (NP (DT A) (JJ dietary) (JJ nonessential) (JJ amino) (NN acid)))) (, ,) (NP (NN tyrosine)) (VP (VBZ is) (NP (NP (DT a) (NN component)) (PP (IN of) (NP (NP (NN thyroxin)) (, ,) (NP (NP (DT a) (NN hormone)) (VP (VBN secreted) (PP (IN by) (NP (DT the) (NN thyroid) (NN gland))))))))) (. .)))
L-Tyrosine A dietary nonessential amino acid, tyrosine is a component of thyroxin, a hormone secreted by the thyroid gland.
(ROOT (S (NP (NNS Catecholamines)) (VP (VBP are) (NP (NP (DT a) (NN class)) (PP (IN of) (NP (JJ amine) (NNS hormones))) (SBAR (WHNP (WHNP (DT that)) (NP (WRB when) (JJ synthesised))) (S (VP (VBP form) (NP (DT the) (JJ amino) (NN acid) (NN tyrosine))))))) (. .)))