Neurotransmitter metabolism
Tyrosine can take the catecholamines pathway, being sequentially converted to DOPA, Dopamine, Norepinephrine and Epinephrine through the TH, DDC, DBH and PNMT enzymes
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Phenylalanine
Protein 101
The first amino acid to be discovered was asparagine, in 1806 and the last of the 20 to be found, threonine, was not identified until 1938