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                  Biological Magnetic Resonance Data BankA Repository for Data from NMR Spectroscopy on Proteins, Peptides, Nucleic Acids, and other Biomolecules  | 
                
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	Alkaptonuria is a rare condition in which a person's urine turns a dark brownish-black color when exposed to air.
| Gene Name | Chromosome number | 
|---|---|
| HGD | 3 |