Gtp Cyclohydrolase I Deficiency, also known as hyperphenylalaninemia, bh4-deficient, b,is related to hyperphenylalaninemia, bh4-deficient, b and gtp cyclohydrolase 1-deficient dopa-responsive dystonia,and has symptoms including lethargy, lethargy and muscle rigidity. An important gene associated with Gtp Cyclohydrolase I Deficiency is GCH1 (GTP Cyclohydrolase 1)

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