Flow chart for the chemical processes involved in the breakdown of methionine, an essential amino acid found in dietary protein. Homocystinuria results when the enzyme cystathionine b-synthase is missing and does not break down homocystine, a converted form of excess methionine. The elevated levels of methionine and homocystein that result from the failure of homocysteine to break down into cystathionine and cysteine causes a disease state that affects multiple body systems. (Gale Group)
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- Homocystinuria