noun. a non-vital amino acid found in most proteins. It is a precursor of the catecholamine neuro-transmitters: norepinephrine, dopamine, and epinephrine, that vary anatomically only in the group at one position of the molecule.

TYROSINE: "Tyrosine stems from the essential amino acid known as phenylalanine."
Cite this page: N., Pam M.S., "TYROSINE," in PsychologyDictionary.org, April 29, 2013, https://psychologydictionary.org/tyrosine/ (accessed September 17, 2021).