Assertion: alkaptonuria's urine | /r/HasProperty | black
Facets:
Source sentences:
text: Homogentisic acid will also make the urine to be black and sometimes, brown upon exposure to air.
text: The corner stones of diagnosis are the examination of the urine (black color) and the histopathological examination with hematoxylin-eosin staining confirming the ochronotic pigments in the tissues.
text: Alkaptonuria is a rare genetic metabolic disorder, which can cause black urine.