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Tyramine-d4 is intended for use as an internal standard for the quantification of tyramine by GC- or LC-MS. Tyramine is a tyrosine-derived endogenous and dietary monoamine and trace amine-associated receptor 1 (TAAR1) agonist.1,2,3 It activates TAAR1 (EC50s = 0.08, 0.69, and 2.26 μM for rat, mouse, and human-rat chimera receptors, respectively).1 Tyramine also inhibits the release of norepinephrine and dopamine in isolated rat caudate nucleus (IC50s = 40.6 and 119 nM, respectively).4

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