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Alkaptonuria
- Alkaptonuria is a rare condition in which a person's urine turns a dark brownish-black color when exposed to air. Alkaptonuria is part of a group of conditions known ...
- ... total urine amino acids may be due to: Alkaptonuria Canavan disease Cystinosis Cystathioninuria Fructose intolerance Galactosemia Hartnup ...