Aromatic Polar amino acid Tyr Y RNA code: UAU, UAC
Tyrosine plays an important role in signal transduction because protein tyrosine kinases and receptor tyrosine kinases can phosphorylate the amino acid within proteins.
Tyrosine is a biosynthetic precursor of the thyroid hormone thyroxine (T4) and triiodothyronine (T3), the pigment melanin, the catecholamine neurotransmitter dopamine and norepinephrine, the neurotransmitter/hormone epinephrine, and in the opium poppy, morphine.
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