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Tyrosine is a non-essential amino acid, which is the raw material of various products of the body. Tyrosine can be converted into a variety of physiological substances through different metabolic pathways in the body, such as dopamine, epinephrine, thyroxine, melanin and poppy (opium). ) of papaverine. These substances are closely related to the control of nerve conduction and metabolic regulation. The study of tyrosine metabolism can help to understand the pathological process of certain diseases. For example, black black acid is related to tyrosine metabolism disorder. The lack of black acid oxidase in the patient's body causes black acid, a metabolite of tyrosine, to continue to be decomposed. It is excreted from the urine and oxidized to black substances in the air. Children's diapers will gradually turn black when exposed to the air, and this kind of urine will also turn black for a long time. Albinism is also related to the metabolism of tyrosine. The lack of tyrosinase makes the tyrosine metabolite 3,4-dihydroxyphenylalanine unable to form melanin, resulting in white hair and skin.