( ( Tyrosine ( ( A ( nonessential ( amino acid ) ) ) ( ( ( ( used ( to ( manufacture ( adrenal ( and ( thyroid hormones ) ) ) ) ) ) , ) and ) ( converted ( into ( the ( skin ( pigment melanin ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Tyrosine) (NP (NP (DT A) (JJ nonessential) (JJ amino) (NN acid)) (VP (VP (VBN used) (S (VP (TO to) (VP (VB manufacture) (NP (NN adrenal) (CC and) (NN thyroid) (NNS hormones)))))) (, ,) (CC and) (VP (VBN converted) (PP (IN into) (NP (DT the) (NN skin) (NN pigment) (NN melanin))))))) (. .)))
Tyrosine A nonessential amino acid used to manufacture adrenal and thyroid hormones, and converted into the skin pigment melanin.
(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))))))) (. .)))