Assertion: alkaptonuria's urine | /r/CapableOf | turn dark brown
Facets:
value: on prolonged exposure to oxygen
type: TEMPORAL
value: after the addition of an alkali
type: TEMPORAL
Source sentences:
text: People with alkaptonuria also have urine that turns dark brown or black when it’s exposed to air.
text: The presenting symptom of alkaptonuria is that of urine that turns dark brown or black on prolonged exposure to oxygen or rapidly after the addition of an alkali.