Assertion: alkaptonuria's urine | /r/AtLocation | standing
Facets:
Source sentences:
text: This is rapidly cleared by the kidney but, if the urine is left standing, it is oxidised to form a pigmented polymer that colours the urine black.
text: This is rapidly cleared by the kidney but, if the urine is left standing, it is oxidized to form a pigmented polymer that colors the urine black.