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270 Disorders of amino-acid transport and metabolism

          Excludes: abnormal findings without manifest disease (791-796)
           disorders of purine and pyrimidine metabolism (277.2)
           gout (274.-)

270.0 Disturbances of amino-acid transport

          Cystinosis Glycinuria (renal)
          Cystinuria Hartnup disease
          Fanconi (-de Toni) (-Debr82) syndrome

270.1 Phenylketonuria

          Hyperphenylalaninemia

270.2 Other disturbances of aromatic amino-acid metabolism

          Albinism Hypertyrosinemia
          Alkaptonuria Oasthouse urine disease
          Disturbances of metabolism of Ochronotic arthritis
           tyrosine and tryptophan Tyrosinosis
          Hydroxykynureninuria Tyrosinuria
          Excludes: vitamin B6-deficiency syndrome (266.1)

270.3 Disturbances of branched-chain amino-acid metabolism

          Disturbances of metabolism of leucine, isoleucine, and valine
          Hypervalinemia
          Leucinosis
          Maple syrup urine disease

270.4 Disturbances of sulphur-bearing amino-acid metabolism

          Cystathioninuria Homocystinuria
          Disturbances of metabolism of Hypermethioninemia
           methionine, homocystine,
           and cystathionine

270.5 Disturbances of histidine metabolism

          Histidinemia
          Hyperhistidinemia
          Imidazole amino aciduria

270.6 Disorders of urea cycle metabolism

          Argininosuccinic aciduria Hyperammonemia
          Citrullinemia Hyperornithinemia
          Disorders of metabolism of
           ornithine, citrulline,
           argininosuccinic acid,
           arginine, and ammonia

270.7 Other disturbances of straight-chain amino-acid metabolism

          Hyperglycinemia Other disturbances of metabolism of
          Hyperlysinemia glycine, threonine, serine,
          Pipecolic acidemia glutamine, and lysine
          Saccharopinuria

270.8 Other

          Ethanolaminuria Iminoacidopathy
          Hydroxyprolinemia Sarcosinemia
          Hyperprolinemia

270.9 Unspecified

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